British Airways says it will take "some time" for flights to get back to normal, despite the end of a two-day strike by pilots.Nearly 150 aircraft are out of place, along with more than 700 pilots and 4,000 cabin crew, it said, reports BBC.
BA was forced to cancel almost all of its flights on Monday and Tuesday due to the strike over pay.
But it expects further disruption in the coming days as it tries to get customers to their destinations.
"Due to the union's strike action, nearly half of our fleet of over 300 aircraft and more than 700 pilots will start the day in the wrong place [on Wednesday].
The airline is offering affected customers refunds or the option to re-book to another date of travel or an alternative airline.
Tens of thousands of flights had to be cancelled, costing BA an estimated £40m a day.It called on the airline to come "back to the negotiating table with some meaningful proposals" to try to avert the next scheduled strike, on 27 September.
Pilots had previously rejected an 11.5% pay increase over three years proposed by BA in July.
BA has said its pilots are already paid "world-class" salaries, and has described the pay offer as "fair and generous".
After three years of the proposed pay deal, some captains could be taking home more than £200,000 per year, including allowances, it said.