Daniel got on a plane in Athens, saw the safety card covered in a logo he didn't recognize, heard Portuguese and English but no Hebrew, and spotted a Maltese registration on the tail. The livery said Arkia. Nothing else did. So he did what any reasonable person does — asked ChatGPT what on earth Hi-Fly is and what language the cabin crew were speaking.
And got a crash course in ACMI leasing at thirty-five thousand feet.
That's the prompt. Daniel wants to know what other kinds of aircraft leasing exist, how they differ from the full-service ACMI end, and what types of airlines use each — and why. He called ACMI the extreme end of the spectrum, where the lessor essentially stands up a white-label airline. Which is about right.
It's exactly right. ACMI is just one point on a ladder that runs from "here's a plane, good luck" to "here's a fully operational airline in a box, we'll paint it your color." Most passengers never see any of the rungs below the surface. Daniel spotted it because the surface cracked a little — wrong safety card, wrong language, wrong tail number.
So let's start with the thing that caught his eye — the flight itself — and work outward. What was he actually flying?
He was on a Hi-Fly A330-200, registered 9H-HFA in Malta. Hi-Fly is based in Lisbon, founded in 2005, and they do exactly one thing: ACMI and charter. Their fleet is all widebodies — A330s, A340s, they even operated the A380. They don't sell tickets to passengers. They sell operational capacity to airlines. Arkia needed to move people from Athens to Tel Aviv, Hi-Fly provided the entire operation under Arkia's paint job, and Daniel bought a ticket from Arkia without ever being told a Portuguese carrier would actually fly the plane.
ACMI — Aircraft, Crew, Maintenance, Insurance. The lessor provides all four. The airline provides the route rights, the schedule, and the fuel. Hi-Fly operates under its own Air Operator Certificate, not Arkia's. That's the key piece.
And that AOC distinction is the thing most people get wrong. Let me build the ladder from the bottom up, because it makes the regulatory logic much clearer. At the lightest end, you've got a dry lease. The lessor hands over an aircraft — no crew, no maintenance, no insurance. Just the metal. The airline puts it on its own AOC, staffs it with its own pilots, maintains it in its own hangars, and insures it under its own policies. These run five to ten years. It's long-term fleet planning. An airline like Delta isn't going to buy every 737 it flies — it'll dry-lease a chunk of them from AerCap or Air Lease Corporation and operate them exactly like owned aircraft.
So the passenger experience on a dry-leased plane is identical to an owned one. Same crew, same procedures, same everything. The lease is a financing arrangement, not an operational one.
Right. The airline's name is on the AOC, the airline's pilots are in the cockpit, the airline's flight attendants are in the cabin. The fact that the airframe is technically owned by a leasing company in Dublin is invisible to everyone except the accountants. Now, step up one rung: damp lease. This is the weird middle child that nobody outside the industry talks about.
Damp lease. Sounds like a complaint.
It kind of is. A damp lease means the lessor provides the aircraft and some crew — usually just the flight deck — but the airline provides cabin crew and handles maintenance in-house. It's a patch. You've got planes but not enough qualified captains, maybe because you're transitioning to a new type and your pilots are still in training. Or you've got a seasonal surge and you can't hire fast enough. So you bring in pilots from a lessor like Avion Express, they fly your plane under your AOC, but your own flight attendants work the cabin. The passenger sees the airline's cabin crew, hears the airline's service patter, and has no idea the two people up front are contractors.
And the maintenance is still the airline's problem.
In a damp lease, yes. The airline keeps the plane airworthy. The lessor is just filling a crew gap. Now, wet lease — this is where it gets closer to what Daniel experienced, and where the terminology gets sloppy. In a wet lease, the lessor provides the aircraft and the full crew — flight deck and cabin — but the airline handles maintenance and insurance in-house. Terms are shorter, one to twenty-four months typically. You use a wet lease when you've got an unexpected capacity crunch — a plane in heavy maintenance, a fleet grounding, a new route you want to test before committing your own metal.
So what's the actual line between wet lease and ACMI?
This is the misconception that drives me up the wall. People use "wet lease" and "ACMI" interchangeably, and they're not the same thing. In a wet lease, the lessor's crew operates under the lessee's AOC. The airline is still the operator of record from a regulatory standpoint. The lessor is supplying a crew that temporarily works under the airline's operational authority. In an ACMI lease, the lessor operates under its own AOC. Hi-Fly doesn't fly under Arkia's certificate — it flies under its own Portuguese or Maltese certificate. Arkia is buying capacity, not sub-leasing its operational authority.
So the liability sits in different places.
Completely different. If something goes wrong on a wet-leased flight, the airline's AOC is on the line. On an ACMI flight, it's the lessor's certificate at stake. That changes everything — regulatory oversight, insurance structure, crew training standards, maintenance audits. The passenger sees the same thing in both cases — a plane painted in one airline's colors with another airline's crew — but the legal architecture underneath is entirely different.
And ACMI is the full package. Aircraft, crew, maintenance, insurance — all from the lessor. The airline is basically buying a turnkey operation. Terms can be as short as a single flight.
Hi-Fly will do a one-off. You need to move three hundred people from point A to point B tomorrow? They'll show up with a plane, a crew, a maintenance plan, and an insurance policy, and you just pay by the block hour. That's the extreme end Daniel was talking about. The airline is reduced to a marketing and distribution layer — it sells the ticket, brands the plane, and handles passenger handling at the gate, and everything else is someone else's operation.
So those are the four types on paper. Dry, damp, wet, ACMI. But the interesting question is why an airline would pick one over another. What's the calculus?
It's a tradeoff between control and flexibility, with cost as the third variable. Dry lease gives you maximum control — the plane is yours operationally for the better part of a decade — but minimum flexibility. You're committed. ACMI gives you maximum flexibility — you can add capacity tomorrow and drop it next week — but minimum control, and it's expensive per hour. Wet and damp sit in the middle.
How expensive are we talking?
ACMI rates are typically one and a half to three times dry lease rates per month. But that's comparing apples to oranges, because the dry lease rate doesn't include crew salaries, training, maintenance reserves, insurance premiums, or regulatory compliance overhead. When you factor in all the fixed costs of standing up your own operation, a short-term ACMI arrangement can actually be cheaper than trying to do it yourself. If you need extra capacity for three months, you don't hire and train pilots, you don't set up a maintenance base, you don't negotiate new insurance. You write a check to Hi-Fly and they handle everything.
So it's expensive per hour but cheap in terms of organizational overhead.
And that's before you get into the regulatory arbitrage. This is where it gets interesting. Let's say you're an Israeli airline and you want to fly to a country with which Israel has no bilateral air services agreement. Your own aircraft, registered in Israel, can't get the traffic rights. But Hi-Fly's Maltese-registered A330 can. Malta has different bilaterals. So you ACMI-lease the Hi-Fly plane, paint it in your colors, and suddenly you're serving a route your own AOC can't touch.
El Al has done exactly this.
El Al has used ACMI carriers including Hi-Fly to operate flights to destinations where Israeli-registered aircraft face restrictions. The Maltese registration sidesteps the whole issue. It's not a loophole exactly — it's a feature of the international aviation system. Air services agreements are between states, and they're tied to the registration of the aircraft and the AOC of the operator. Change the registration and the AOC, and you change which bilaterals apply.
So ACMI isn't just about capacity. It's a geopolitical routing tool.
It's a geopolitical routing tool, it's a fleet transition bridge, it's a seasonal surge absorber. Air France used Hi-Fly's A380 during the 2024 Olympics — they needed extra widebody capacity for a few months, didn't want to wet-lease a 747, and Hi-Fly had an A380 sitting around. Hi-Fly operated it under their own AOC in Air France colors. Passengers boarding at Charles de Gaulle thought they were getting on an Air France A380. They were not.
And that's the thing Daniel noticed. The surface didn't quite match. The safety card had the wrong logo. The crew didn't speak Hebrew. The tail had a Maltese registration. Most passengers wouldn't notice any of that.
Most passengers don't. And airlines don't exactly go out of their way to tell you. If you dig into the fine print of your ticket, there's usually a line that says "operated by" with a different carrier name. But it's buried. The branding, the livery, the gate signage, the boarding pass — everything is designed to make you think you're flying the airline you booked.
Which raises the question — who are the big players in this space? Daniel asked what kinds of airlines use each type.
The leasing world splits into two very different industries. On the dry lease side, you've got the giants. AerCap is the largest — over a thousand aircraft. Air Lease Corporation, SMBC Aviation Capital, BOC Aviation. These companies own enormous fleets and lease them out on five-to-ten-year terms to basically every major airline on the planet. They're financing companies, essentially. They buy planes from Boeing and Airbus in bulk, get discounts the airlines can't get individually, and lease them out with financing terms that work better than the airline buying the plane outright.
And they never touch operations. They don't crew a single flight.
They don't have pilots. They don't have flight attendants. They have finance people, maintenance tracking specialists, and lawyers. Lots of lawyers. The ACMI world is completely different. The specialists — Hi-Fly, Air Atlanta Icelandic, EuroAtlantic Airways, Avion Express — are much smaller. A few dozen aircraft each, not hundreds. But they occupy a critical niche. They're the surge capacity of the global airline industry. When something breaks, when a route suddenly needs capacity, when a fleet gets grounded, when a war or a pandemic or an Olympic Games creates a demand spike that nobody planned for — these companies absorb it.
Air Atlanta Icelandic. That's a name that sounds like it was generated by an AI.
They're real, and they're fascinating. Based in Iceland, they specialize in widebody ACMI and charter. They've flown for everyone from the US military to major European carriers. Their whole business model is being ready to go anywhere on short notice with a fully crewed widebody. It's the same playbook as Hi-Fly, just a different home base and a different set of bilaterals to exploit.
So the dry lease market is dominated by financial leasing companies with massive fleets and long horizons. The ACMI market is smaller, nimbler operators who sell operational capacity by the hour. What about the middle — who's doing wet and damp leases?
A mix. Some ACMI specialists will do wet leases too — they'll provide crew but let the airline handle maintenance if that's what the customer wants. There are also regional players. Avion Express, for example, is a Lithuanian ACMI and wet lease operator that mostly flies narrowbodies — A320 family — for European carriers. They're the go-to for a European low-cost carrier that needs an extra A320 for the summer season but doesn't want to hire a whole new crew base.
And damp leases? Who's actually doing those?
Damp leases are less common as a standalone product. They tend to be ad hoc arrangements. A small carrier in Africa or Southeast Asia might damp-lease a plane from a larger regional airline — the lessor provides the aircraft and the captains, the lessee provides cabin crew and maintenance. It's often a bridge solution while the lessee trains its own pilots on a new type. You see it in markets where pilot shortages are acute and type-rated captains are hard to find.
The market segments by time horizon and operational need. Dry lease for strategic fleet growth. Damp lease for pilot gaps. Wet lease for short-term capacity crunches. ACMI for maximum flexibility and regulatory workarounds.
The cost scales accordingly. Dry lease is cheapest per month but commits you for years. ACMI is most expensive per block hour but commits you for as little as a single flight. The whole industry is a ladder of commitment versus flexibility, and airlines climb up and down it constantly depending on what's happening to their fleet, their routes, and their regulatory environment.
What about the passenger experience across these types? Daniel's whole prompt started because he noticed something was off. On a dry lease, the passenger notices nothing. On a damp lease, the cabin crew is still the airline's own — so the service feels normal, even if the pilots up front are contractors. On a wet lease, the cabin crew might be from the lessor, so the service style changes. And on ACMI, the whole operation is someone else's.
The language thing Daniel noticed is a dead giveaway. On an ACMI flight, the crew may not speak the local language of the airline they're flying for. Hi-Fly's crews are Portuguese and English-speaking. They're not learning Hebrew for a three-month Arkia contract. So the safety briefing is in English, the announcements are in English, and if a passenger only speaks Hebrew, they're relying on the seatback card — which, as Daniel noticed, might have the wrong logo on it.
The safety card is a fascinating artifact. It's one of the few physical touchpoints between the passenger and the operating carrier's identity. On an ACMI flight, the lessor is supposed to swap out the safety cards to match the marketing carrier's branding. But sometimes they don't. Or they do it incompletely. Or they use generic cards that don't match either airline.
That's not a small thing. The safety card is a regulatory document. It has to accurately reflect the configuration of that specific aircraft. If Hi-Fly operates an A330-200 with a particular seat layout and emergency exit configuration, the safety card has to match that exact layout. Slapping an Arkia-branded card into a seat pocket only works if the card was designed for that aircraft type in that configuration. Sometimes it's close enough. Sometimes it isn't.
Which brings us to something Daniel didn't ask directly but is lurking in the prompt — should passengers be told? Is there a transparency problem here?
The industry position is that it's disclosed in the fine print and that's sufficient. The "operated by" line on your ticket or booking confirmation is the legal disclosure. But let's be honest — nobody reads it. And even if you do, "operated by Hi-Fly Malta" means nothing to ninety-nine point nine percent of passengers. They board the plane, see the familiar livery, and assume they're flying the airline they booked.
There's a consumer protection question here that regulators haven't really touched. If you booked Arkia because you wanted an Israeli crew, Israeli safety standards under the Israeli CAA, and an Israeli AOC — you didn't get any of that. You got a Portuguese crew, Portuguese safety oversight, and a Maltese AOC. The livery was Arkia. The operation was Hi-Fly.
To be fair, Hi-Fly is a perfectly reputable carrier. They're IOSA certified, they meet international safety standards. This isn't about safety — it's about what you thought you were buying. If you book a Hilton and get checked into a Marriott with a Hilton sign out front, you'd be annoyed even if the Marriott was perfectly nice. The aviation industry has normalized a level of brand substitution that would be scandalous in almost any other consumer context.
The counterargument is that without ACMI, many routes simply wouldn't exist. Arkia might not be able to serve Athens-Tel Aviv with its own metal and crew during peak season. The choice isn't between an Arkia-operated flight and a Hi-Fly-operated flight — it's between a Hi-Fly-operated flight and no flight at all.
That's the industry's strongest argument, and it's not wrong. ACMI capacity enables routes that wouldn't be economically viable otherwise. It enables airlines to respond to demand spikes without maintaining expensive standby capacity year-round. It enables smaller carriers to enter markets they couldn't serve with their own aircraft. There's real consumer benefit here. The question is whether the benefit requires the opacity.
Alright. So we've got the ladder — dry, damp, wet, ACMI. We've got the economics — control versus flexibility, with cost as the third variable. We've got the regulatory distinction — whose AOC is the flight operating under. And we've got the passenger experience layer that Daniel's prompt opened up. I think we've covered the structure. What about the market dynamics? Who's growing, who's shrinking?
The dry lease market is enormous and keeps growing. AerCap alone has a fleet value north of fifty billion dollars. The trend over the past twenty years has been airlines moving away from owning aircraft and toward leasing — it frees up capital, it's more flexible, and the leasing companies can place orders more efficiently than individual airlines. Something like half of all commercial aircraft flying today are leased, not owned by the operator.
On the ACMI side?
ACMI is growing too, driven by a few structural factors. Pilot shortages are the big one. Training pipelines aren't producing enough pilots, especially for widebodies. Airlines that want to expand or replace retiring captains can't always find the people. ACMI lets them buy capacity without solving the personnel problem. Fleet transitions are another — when you're retiring your 747s and waiting for your 787s to arrive, you've got a two-year gap. ACMI fills it. And then there's the geopolitical routing workarounds we talked about.
Plus, I'd add, the rise of the virtual airline model. There are carriers now that operate with zero owned aircraft — they're entirely ACMI-based. They're a brand, a website, a distribution system, and a call center. Everything with wings is someone else's problem.
The line between an airline and a marketing company is getting blurrier every year. And that loops back to Daniel's original observation — if the trend continues, more and more passengers are going to have the experience he had. Boarding a plane that looks like one airline but is operated by another, with crew who don't speak the local language and safety cards that don't quite match.
We've walked the ladder, we've done the economics, we've flagged the transparency question. I want to pull on one more thread before we wrap the core discussion. Daniel mentioned that Hi-Fly is based in Portugal but the plane was registered in Malta. Why Malta?
Malta's aircraft registry is one of the largest in Europe, and it's not because Malta has a huge aviation industry. It's because Malta offers an attractive regulatory and tax environment for aircraft registration. The Maltese CAA is respected internationally, the registration process is efficient, and the tax treatment for leasing companies is favorable. A lot of ACMI operators register their aircraft in Malta even if their operational base is elsewhere. Hi-Fly has aircraft on both the Portuguese and Maltese registries.
Even the tail number Daniel spotted is part of a larger story about regulatory arbitrage in aviation. The aircraft's registration determines which bilaterals apply, which safety authority oversees it, and which tax regime it falls under. It's not random.
It's never random. The registration is a strategic choice. Hi-Fly's Maltese-registered aircraft can operate under EU traffic rights while benefiting from Malta's tax treaties and regulatory framework. It's the same reason so many ships fly the Panamanian flag. The flag on the tail is a business decision.
Alright. I think we've earned the right to hear from someone who's actually touched this industry from the inside.
Hilbert: You've got the types right and the AOC distinction right. But you're missing the scale. ACMI is far more common than you made it sound. I'm not talking about the big headline deals — the Air France Olympic A380 or the El Al geopolitical workarounds. I'm talking about the routine stuff. The Tuesday afternoon flight from Manchester to Tenerife that's operated by a Lithuanian A320 with a British airline's paint job. The summer season surge capacity that every European leisure carrier depends on. It's not exotic. It's infrastructure.
How routine are we talking?
Hilbert: In the European summer season, something like ten to fifteen percent of all short-haul capacity is wet-leased or ACMI. The low-cost carriers don't advertise it, but their business models depend on it. They run lean in the winter and surge in the summer, and they can't hire and train crews fast enough to cover the peaks. So they bring in Avion Express or SmartLynx or GetJet, and those planes fly Ryanair or EasyJet or TUI routes for four months. The passenger never knows.
Ten to fifteen percent is higher than I'd have guessed.
Hilbert: I know because counting them used to be my job. Late nineties, I worked ground ops for Air Luxor out of Lisbon — same airport as Hi-Fly, actually. My title was ground operations coordinator, which meant I met the planes at whatever hour they landed and made sure the branding was right for the next morning's flight. Safety cards, seatback literature, headrest covers, the little logo on the welcome screen if the IFE had one. I had boxes of this stuff for a dozen different airlines. Same plane, same crew, different stickers.
Air Luxor. That's a name I haven't heard in years. They went under in what, two thousand six?
Hilbert: Two thousand six. The fleet got scattered. A few A330s went to Hi-Fly, actually. But the point is, I'd stand in a cargo hold at three in the morning with a box of laminated safety cards, peeling off one airline's stickers and slapping on another's. The plane was the same plane. The crew was the same crew. But the piece of paper in the seat pocket said you were flying with someone else. That's the whole industry in a microcosm — a legal fiction held together by laminated cards and a Maltese registration.
The phonetic safety announcement thing. Is that real or is that an urban legend?
Hilbert: It's real. We had a contract with a Middle Eastern carrier — I won't say which one — and the cabin crew had to learn a scripted safety announcement in a language none of them spoke. They memorized it phonetically. Six weeks of training. The passengers thought they were listening to a native speaker. The crew had no idea what they were saying. Could have been reciting a recipe for all they knew.
That's the line between a wet lease and a dry lease — about six weeks of phonetic training.
Hilbert: The funnier part was the return flight. Same crew, same plane, but now they were flying under the Middle Eastern carrier's competitor's brand. Different safety card, different headrest covers, different phonetic script. The crew just had to remember which language they were pretending to speak that day.
Did anyone ever notice?
Hilbert: Once, that I know of. Passenger in the exit row asked a question in the local language and the flight attendant just smiled and pointed at the safety card. The passenger complained to the airline. The airline complained to us. We sent a memo. Nothing changed. That's ACMI.
The memo that changes nothing is its own genre in aviation.
Hilbert: I've still got one of those safety cards somewhere. The generic one we used as a template before we printed the airline-specific versions. It's in a box. It's for an aircraft type I never actually worked with — an A310. We kept it around because you never knew when someone would ask for an A310 lease, and we wanted to look prepared.
Did anyone ever ask?
Hilbert: No. But we were prepared.
If you take one thing from this episode, it's that the airline you booked and the airline that flies you are not always the same thing — and the gap between them is an entire industry most passengers never see.
The gap has a structure. Dry, damp, wet, ACMI. It's a ladder of how much operational reality you're outsourcing, and the rung an airline picks tells you something about what problem they're solving — fleet growth, crew shortages, capacity crunches, or regulatory workarounds.
The open question I keep coming back to is whether the transparency norms will shift. As ACMI grows — and it is growing, driven by pilot shortages and fleet transition cycles — more passengers are going to have Daniel's experience. At some point, regulators might decide that "operated by" in six-point font on page seven of the booking confirmation isn't sufficient disclosure.
Or they might not. The industry has a strong argument that the current system works, and passengers mostly don't care as long as the plane gets there safely and on time. But I think the virtual airline trend pushes in the other direction. If an airline is nothing but a brand and a website, at what point does the passenger have a right to know that the actual operation is entirely outsourced?
That's the thing to watch. The line between airline and marketing company is blurring, and the regulatory framework was written for a world where the brand on the tail meant the operator in the cockpit. That world is fading.
This has been My Weird Prompts. Thanks to our producer Hilbert Flumingtop for keeping this show running — and for the safety card collection we're all now curious about.
If you've got a weird prompt — something you noticed on a trip, something that made you ask ChatGPT a question at thirty-five thousand feet — send it to us at show at my weird prompts dot com. We'll do the research.
We'll be back soon.
