Lufthansa's $10 billion government bailout was thrown into doubt on Wednesday after the German airline's supervisory board refused to accept the conditions attached by Brussels.
The board, which had been expected to sign off on the aid, instead refused EU requirements that Lufthansa permanently give up take-off and landing slots at Frankfurt and Munich airports, where it commands a two-thirds market share.
The bailout plan nevertheless remains "the only viable alternative" to insolvency, Lufthansa said, and negotiations will continue over EU demands that would "lead to a weakening" of its airport hubs as well as its ability to repay loans.