Air France-KLM has said its strike last September cost the airline €495m in lost revenue.
It reported a drop in its full-year profits saying the strike, which was the longest in 20 years, offset the savings made by lower fuel prices.
The strike was due to a dispute with pilots over plans to expand the group’s budget airline Transavia.
The airline group said it planned to cut investment by €300m euros a year in 2015 and 2016, reports the BBC.
Chief executive Alexandre de Juniac, said: "With the way we see the market developing, except for the North Atlantic, we are being very, very cautious."
