British Airways have said that they will operate more than 60% of longhaul flights and more than 50% of shorthaul flights at Heathrow during the first cabin crew strike next week.

The Unite union announced on Monday that members would strike for 20 days through May and June, including during the school half-term week, in a walk-out which could hit nearly 1.8m passengers.

Cabin crew will stage four separate blocks of five-day walkouts on 18 May, 24 May, 30 May and 5 June, returning to work for 24 hours between each strike.

"All flights at Gatwick will operate as normal as will flights to and from London City airport during the entire strike period," said a spokesperson for BA.

Passengers are advised to visit the designated strike section of BA's website to check if their flight is affected.