Some short-haul BA flights from Heathrow are still affected, as the airline continues to deal with the fallout from an IT crash.
The airline said it intends to run a full schedule at Gatwick on Monday and to operate a full long-haul schedule and a «high proportion» of its short-haul programme at Heathrow.
BA passengers have been told to check the status of their flights before travelling to the airports where scenes of chaos unfolded over the weekend.
The airline claimed it was making «good progress» in recovering from the worldwide IT glitch.
A BA spokeswoman said: «We operated a full schedule at Gatwick on Sunday. At Heathrow, we operated virtually all our scheduled long-haul flights, though the knock-on effects of Saturday’s disruption resulted in a reduced short-haul programme.
«As our IT systems move closer to full operational capacity, we will again run a full schedule at Gatwick on Monday and intend to operate a full long-haul schedule and a high proportion of our short-haul programme at Heathrow.
«We apologise again to customers for the frustration and inconvenience they are experiencing and thank them for their continued patience.»
Travellers spent the night sleeping on terminal floors on Saturday after BA cancelled all flights leaving the London hubs, while disruption continued into Sunday with dozens more services from Heathrow axed.
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The IT outage had a knock-on effect on BA services around the world, while passengers who did get moving on the limited number of flights to take off from the UK reported arriving at their destinations without their luggage.
Alex Cruz, the airline’s chairman and CEO, issued a video message on Twitter to reassure passengers about their lost luggage and apologise.
«I know this has been a horrible time for customers. Some of you have missed holidays, some of you have been stranded on aircraft, some of you have been separated from your bags. Many of you have been stuck in long queues whilst you waited for information, » he said.
«On behalf of everyone at BA I want to apologise for the fact that you had to go through these very trying experiences.»
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Experts predict the knock-on effect could continue for several days and BA is facing huge compensation costs, with reports suggesting the bill could top £100m.
The airline blamed the computer blackout on a «power supply issue» and said there was no evidence of it resulting from a cyberattack.
Some experts expect the disruption to last several days, as planes and aircrew are returned to their positions and the backlog of passengers is cleared.
Air industry consultant John Strickland said: «There’s a massive knock-on effect.
«Customers and — from the airline’s point of view — manpower, dealing with the backlog of aircraft out of position, parking spaces for the aircraft… It’s a challenge and a choreographic nightmare.»
