Fly4 Airlines Enters Provisional Liquidation, Grounding All Four 737s

Dublin-based ACMI and charter specialist Fly4 Airlines has petitioned the Irish High Court to place itself into provisional liquidation, with all four of its B737-800s already parked across three European airports.

The court appointed restructuring specialists Brendan O'Reilly and Mark Degnan as joint provisional liquidators of Fly4 Airlines Green Limited. The company cited a material deterioration in its financial position during 2026, and its flying programme concluded at the end of October.

The liquidators' immediate priority is taking control of the company's affairs, securing and preserving assets, and engaging with a wide set of stakeholders: employees, aircraft lessors, regulators, creditors and maintenance providers. That list tells you where the money pressure sits — lessors and staff come first in any ACMI wind-down.

What does the grounding look like on the ground?

ADS-B tracking data shows all four B737-800s grounded between 28 October and 6 November 2026, with two parked at Istanbul Atatürk, one at Nuremberg and the fourth at Brussels National. A fifth 737-800 was still due for delivery — a commitment the liquidators now have to unwind with the lessor concerned.

For context on scale: four narrow-bodies is a small fleet even by ACMI standards, where operators like Smartwings or Avion Express run multiples of that. Fly4's pitch was short-notice capacity for airlines, brokers and tour operators, including cover for technical groundings and unexpected demand spikes — a niche that should, in theory, thrive in a tight-capacity market. That it didn't says something about the venture's cost base or commercial terms that the court filings have yet to detail.

Who owns the losses?

Fly4 Airlines was established in 2023, launched flight operations in March 2024 and is headquartered at Dublin International. Ownership is split 51pc to Polish charter carrier Enter Air and 49pc to Germany's TUI Beteiligungs GmbH, the investment arm of the TUI Group.

The venture was created to supply flexible capacity, particularly to TUI and other carriers during peak periods. It was doing exactly that until recently: the carrier was supplying wet-leased B737-800 capacity to Enter Air in 2024 and to Germany's SundAir during October 2026 — the same month its programme wound down.

Neither shareholder has publicly stated what the collapse means for its own capacity planning or balance sheet. Enter Air, as majority owner, carries the larger exposure, and TUI loses a captive peak-season supplier it helped build. How much each has written down is a question the liquidators' first report should answer.

What does this mean for capacity buyers?

The immediate read for airlines and tour operators that relied on Fly4 is straightforward: they need replacement wet-lease cover for winter 2026-27 and next summer's peak. ACMI capacity remains tight industry-wide, so short-notice replacements won't come cheap — exactly the buyers Fly4 was set up to serve.

The liquidators' engagement with aircraft lessors will determine whether the four grounded 737-800s re-enter the lease market quickly, which would add a small amount of narrow-body supply back into the system.

The takeaway: a three-year-old, TUI-backed ACMI venture is in liquidation with four aircraft parked and no stated recovery plan — and its two airline shareholders now have a capacity hole and an undisclosed bill to settle.