The airlines cite staff shortages caused by sickness as the cause of their problems.
BA has grounded at least 96 services to and from its main base at London Heathrow: 18 domestic and 78 European and Mediterranean.
The airline says most passengers were given notice of a week or two of flight cancellations.
Once again, the most-cancelled destination is Milan Malpensa: three of the seven departures from Heathrow are grounded.
In addition the Tuesday night departure from Heathrow to Sao Paulo and Buenos Aires is currently operating 23 hours late.
British Airways to/from Heathrow
- Aberdeen (2)
- Belfast City
- Glasgow (2)
- Amsterdam (2)
- Basel Geneva (2)
- Berlin (2)
- Dublin (2)
- Dusseldorf (2)
- Frankfurt (2)
- Milan Malpensa (3)
- Paris CDG (2)
- Prague (2)
EasyJet from Gatwick
At easyJet’s main base, Gatwick, at least 10 departures and arrivals have been cancelled, including links to Ibiza, Nice and Palma.
In addition, passengers due to fly out on Tuesday evening from Gatwick to Naples have been delayed overnight. The airline told them: “This is due to earlier disruption your flight resulting in the crew reaching their maximum legal working hours.”
All passengers whose flights are cancelled are entitled to new flights and, if the cause is staff sickness, cash compensation – if the cancellation was announced less than two weeks in advance.