The next round of cabin crew strikes to hit British Airways start today.
The industrial action by the airline’s mixed fleet crew will run until August 1.
BA said it expects to operate ‘virtually a full schedule’ but will be merging a very small number of Heathrow services.
"We expect to operate our normal schedule of short-haul flights to and from Heathrow, with our oneworld alliance partner Qatar Airways flying a small number of these services on our behalf," it said.
"We will be updating all of our operational systems with the details of which flights are being served by Qatar Airways on a regular basis."
It told customer to check their booking to see if their flight is now being operated by Qatar Airways.
It added that flights to and from London Gatwick, London City and Stansted will operate as normal, as will its recently launched weekend-only Mediterranean services to and from Birmingham, Bristol and Manchester.
