Reform of UK slot regulations at Level 3 co-ordinated airports is on the cards for 2025. Proposed changes may call time on grandfather rights to slot allocations (take-off and landing rights) that are perceived to give an unfair advantage to incumbent slot holders and present challenges both to established carriers seeking to expand existing services and to new entrants. The UK's Department for Transport (DfT) seeks to make the UK's slot system "more efficient, dynamic and transparent". In August 2024, the Competition and Markets Authority, the UK's competition watchdog, endorsed the DfT's proposed changes. These include (i) a revision of the 'use it or lose it' rule, (ii) redefining the new entrant rule, and (iii) establishing a clear legislative framework for secondary trading of slots.