British Airways is to cut 10,300 more short-haul flights due to feature in its schedule between August and the end of October.
This latest announcement means nearly 30,000 flights will have been removed from BA's schedule between April and October this year.
The industry has struggled with staff shortages as demand for air travel has rebounded after Covid restrictions.
"The whole aviation industry continues to face into significant challenges and we're completely focused on building resilience into our operation to give customers the certainty they deserve," BA said.
Rory Boland, editor of Which? Travel, said the latest cancellations were a "damning indictment" of BA's failure to manage its summer flight schedule.