The Airports Slot Allocation (Alleviation of Usage Requirements) Regulations 2026 come into force on 19 June 2026. In practice, the measure lets airlines at nine coordinated airports return a limited share of slots in the summer 2026 and winter 2026-27 scheduling periods without automatically losing the right to the same slots in the equivalent following season. The Department for Transport says the change is tied to disruption and uncertainty arising from the conflict in the Middle East. (statutoryinstruments.parliament.uk) The airports in scope are Heathrow, Gatwick, Stansted, Manchester, Luton, London City, Birmingham, Bristol and Leeds Bradford, with Leeds Bradford coordinated in summer only. The Explanatory Memorandum says the Regulations extend to England and Wales and Scotland, and not to Northern Ireland because there are currently no coordinated airports there. (commonsbusiness.parliament.uk)
Under the ordinary slot system, an airline usually keeps a series of slots only if it has used them at least 80% of the time in the preceding equivalent season. That continuing entitlement is known as historic rights, and it is commercially significant because coordinated airport capacity is scarce and time-specific. (commonsbusiness.parliament.uk) The 2026 instrument is a targeted legal amendment rather than a wider redesign. The Department is using powers under the Retained EU Law (Revocation and Reform) Act 2023 to revoke and replace Article 10(3) of Regulation 95/93 so that specified hand-backs can be left out of the usage calculation for defined 2026 seasons. (commonsbusiness.parliament.uk)
Before this change, carriers could already return slots before 31 January for the following summer season or before 31 August for the following winter season. Those returned slots were excluded from the 80:20 calculation, but the airline gave up historic rights and the coordinator could reallocate the capacity. There was no in-season hand-back route that preserved those rights after the season had started. (commonsbusiness.parliament.uk) The new Regulations keep that pre-season process, but add a temporary in-season relief for 2026. The policy case, set out by the Department and repeated in parliamentary scrutiny, is that airlines should be able to trim schedules earlier when conflict-related disruption affects costs, routing and demand, instead of holding flights in the programme until late in the season. (commonsbusiness.parliament.uk)
For summer 2026, which runs from 29 March to 24 October 2026, an airline can hand back up to 5% of allocated slots by 10 July 2026 and a further 5% by 11 October 2026. For winter 2026-27, running from 25 October 2026 to 27 March 2027, the equivalent deadlines are 15 November 2026 and 14 March 2027. Within those limits, the returned slots are treated as used for the purpose of the usage calculation. (commonsbusiness.parliament.uk) The relief is not open-ended. The airline must not be permanently ceasing services at the airport concerned, and passengers must receive at least 14 days’ notice of the cancellation of the relevant flights. Parliament’s Secondary Legislation Scrutiny Committee highlighted those conditions as part of the balance built into the scheme. (commonsbusiness.parliament.uk)
The Department for Transport did not adopt the most expansive option put forward in consultation. The Explanatory Memorandum records that most airlines said a 10% hand-back ceiling was too low and suggested at least 20%, while some airports said that, if relief was granted at all, it should be held to 5%. (commonsbusiness.parliament.uk) Ministers kept the cap at 10%, split into two 5% tranches, and dropped an earlier idea that would have blocked the reallocation of handed-back slots. The Government’s position, stated in both the memorandum and Commons debate, is that reallocation should reduce wasted capacity while still giving airlines enough room to plan around disruption. (commonsbusiness.parliament.uk)
For passengers, the practical effect is mainly about notice rather than a change to compensation rules. Ministers told MPs that the measure is intended to bring cancellations forward, and that where UK law applies a cancelled passenger remains entitled to a refund or rerouting at no extra cost. (hansard.parliament.uk) For airports and competing carriers, the trade-off is less favourable. The Department accepts that relief may make it harder for new entrants to build long-term slot holdings and may reduce airport charge income if fewer flights operate, although it also says the administrative cost to Airport Coordination Limited, the UK’s sole slot coordinator, should be minor and that no significant public sector impact is expected. (commonsbusiness.parliament.uk)
In Lords debate, ministers described the change as a time-limited response rather than a permanent rewrite of slot policy. They also said the powers underpinning this instrument expire on 23 June 2026 under the retained EU law framework, with replacement powers being sought through the Civil Aviation Bill. (hansard.parliament.uk) For airlines, coordinators and airports, the immediate compliance position is now clear. The operational deadlines are 10 July and 11 October for summer 2026, then 15 November 2026 and 14 March 2027 for winter 2026-27, alongside the 14-day passenger notice condition and the requirement that the carrier is not permanently withdrawing from the airport concerned. (commonsbusiness.parliament.uk)