British Airways is still cancelling flights in the aftermath of a three-day strike by cabin crew.
The airline's website shows it has cancelled nearly 200, or more than 19%, of flights that had been scheduled up to midnight on Tuesday.
BA is reviewing its schedule for a further strike between 27 and 30 March.
No further talks to resolve the dispute are planned ahead of the next walkout, but unions have challenged BA chief Willie Walsh to return to negotiations.
BA says the majority of services in the next four days will operate normally.
But on Tuesday, in the immediate aftermath of the strike, its services at a number of major British airports continued to be disrupted.
More cancellations
At London Heathrow, its biggest UK hub, it has cancelled 14% of outgoing flights and more than a third (34.2%) of arrivals.
At Manchester, more a a fifth of all services have been cancelled.
At Newcastle, the figure is even higher, at 58.3%.
Aberdeen, with more than 28% of BA flights cancelled, and Glasgow, at 18.2%, are also among the worst-hit.
Gatwick, London City, Birmingham, Belfast and Inverness are unaffected.
In a statement issued to the London Stock Exchange about its operations over the weekend, BA said it estimated the three-day strike had cost the company 7m a day.
But the airline said the industrial action was unlikely to have much impact on its full-year earnings figure.
It suffered a loss before tax of 342m for the nine months to the end of December 2009 and says it needs to cut costs in order to survive.
'Correct positions'
According to the company's website, about a third of flights to and from the UK's main airports on Monday were cancelled.
Unite: 'There are no winners in this dispute'
BA's main hub at Heathrow suffered the biggest disruption, with 201 of the 443 flights before 1700 GMT marked as cancelled on BA's online schedules.
BA said that over the first two days of the strike, it operated 78% of its long-haul flights and 50% of short-haul.
It said it had operated another 70 positioning flights, in most cases carrying cargo, which the airline said had returned passengers home with minimum disruption.
The airline said the stoppage, which ended at midnight on Monday, would continue to affect its operations this week after cabin crew returned to work.
We are sorry for any cancellations, as we get our aircraft, pilots and cabin crew back into the correct positions around the world, the airline said in a statement.
We are contacting customers and offering them a full refund, a rebook or a re-route so that they can get to their destinations.
But it said the vast majority of passengers would be unaffected.
Staff proposals
The strike action is the latest episode in a long-running dispute over changes to pay and conditions by BA that union Unite claims are being unfairly imposed on its members.
Workers are particularly angry that last November BA reduced the number of crew on long-haul flights and is introducing a two-year pay freeze from 2010.
The airline also proposed new contracts with lower pay for fresh recruits.
Unite argues that the actual number who turned up for work during the strike is much lower than BA claims.
Tony Woodley, joint leader of Unite, questioned why BA was funding what he called a floundering strike-breaking operation, pointing out that his members had offered the company their own cost-saving plan of more than 55m.
Speaking to striking cabin crew at a rally near Heathrow, he confirmed that he had been talking to prime Minister Gordon Brown about the strike and was grateful for his attempts to encourage the two sides to reach a negotiated settlement.