Therefore, at the time of writing, the only affected airport is London Heathrow, British Airways' biggest base.
Passengers should note that cancellations are not expected because of the sales restriction as existing bookings will not be affected.
However, those who were planning to book flights from Heathrow airport in the next two weeks will not be able to do so and will need to find an alternative airline and route to get to their destination.
Aviation consultant John Strickland warned flights over the next week will likely be full, leaving "almost no room to manoeuvre to rebook passengers" in case further cancellations or delays take place.
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