The airline says cancellations are required to provide reliable services in the busy holiday period.
Paul Holmes's resignation comes as another Tory MP calls on Boris Johnson to resign over Partygate.
New guidelines say ministers may be asked to apologise or lose pay for breaching standards rules.
Liverpool will look to win European club football's most prestigious prize for the seventh time when they face Real Madrid in a mouth-watering Champions League final in Paris on Saturday.
A serving police officer, Laurence Knight, is accused of raping a woman on a beach.