British Airways has cancelled almost 100 flights from Heathrow during the first day of a second weekend of strike action by cabin crew.
However the airline hopes to fly three quarters of its passengers during the four-day strike, the BBC reports.
BA and the Unite union are in dispute over the airline's cost-cutting plans, which include reducing the numbers of cabin crew on long-haul flights.
In an online message, the airline's boss Willie Walsh said BA was doing everything possible to achieve that and is committed to resolving the dispute.
The Unite union, representing the crew, has warned industrial action could continue after Easter.