The change will take place from May 23 and will affect current Bmi flights to Bergen, Basel, Nice, Vienna, Stavanger, Hanover, Agadir, Marrakech and Casablanca. Although flight schedules and timings on these routes will remain the same.

BA said its policies would now apply to any Bmi flight involved in this switch. BA baggage policies for new bookings will also apply although Bmi’s luggage policy will be honoured for prior bookings.

The airline added that it would operate mainline Bmi’s summer schedule to and from Heathrow so “customers can book with confidence”.

“Further routes will be changed over to British Airways’ system in the coming weeks and customers will receive emails advising them of the change,” said BA in a statement.

“These changes are part of plans to integrate Bmi into British Airways for the start of the winter season, with the gradual transition of flights during the summer.

“During this period, the exterior and interior design of Bmi’s aircraft, as well as the onboard experience will gradually transform into British Airways style”.