EasyJet advised passengers to check in for flights as normal "as the situation can improve", but suggested they refer to the airline's flight tracker page for updates.
A message on its website read: "Although this is beyond easyJet's control, we apologise for any inconvenience that you may experience today."
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Abraham Badru was shot dead in March near his home in Hackney, east London as he went to get drink from the boot of his car.
The hunts would have been the first in US outside Alaska since 1991.
The announcement is part of a global review of manufacturing.