Airline group IAG, the owner of British Airways and Iberia, has said it will temporarily put on hold plans to fly more routes following the Brussels attacks.
It also said there was weaker demand from high-margin business-travellers.
“Revenue trends in quarter two have been affected by the aftermath of the Brussels terrorist attacks, as well as some softness in underlying premium demand. As a result, IAG has moderated its short-term capacity growth plans.”
Shares fell 3.2% in morning trading in London to 532p, making it the biggest faller on the FTSE 100.
“March revenue was affected by the timing of Easter and the Brussels terrorist attacks,” said IAG chief executive Willie Walsh.
IAG reported pre-tax profits of €124m (£96m) for the first quarter, compared with a loss of €37m in 2015.