The UK’s statutory instrument, which amends the UK Slot Regulation to provide alleviation from the use-it-or-lose it rule for W21, is now in force.

Under this, which applies to UK airports, carriers can get full alleviation on series returned prior to 7 September 2021.  They then have to operate 50% of all slots retained for W21.  In addition, the UK has implemented justified non-use provisions.