British Airways (BA) will increase its Heathrow longhaul schedule to more than 80% of flights, during the next five-day cabin crew strike due to start on Saturday.
The figure is up by 20% from the first strike period, by cabin crew members of union Unite.
The airline said it is increasing the number of flights it would operate, due to "growing numbers of cabin crew who want to work as normal".
Gatwick and London City flights remain unaffected.
The airline has also pledged to fly its full schedule (26 departures a week) to South Africa ahead of the World Cup kickoff on June 11.
www.ba.com