British Airways has put the cost of its continuing cabin crew strike at £7 million ($10 million) per day.
The airline says that the strike, which affected the last 14 days of May, resulted in passenger traffic for the month dipping by 11.5%.
Industrial action by cabin crew accounted for a 6% drop in capacity, and the capacity figure across the month as a whole was down by 4.7%.
This resulted in a passenger load factor decline of 5.4 points to 69.7%. Premium traffic fell by 6.5% and non-premium by 12.5%.
"The total cost of the strike period can only be assessed at the end of the disruption and will reflect lost bookings and reduced travel volumes offset by some volume-driven cost savings," says the airline.
Asia-Pacific services were most heavily affected in May, with passenger traffic down more than 23%, while UK and European services recorded a 15% fall.