Opening of Berlin's new Brandenburg airport is being postponed for several months after technical problems with the fire-protection systems.
The new hub - which will replace the capital's Tegel and Schonefeld airports - had been due to open on 3 June.
But the airport's operator admits that the date will be shifted to the end of the summer holiday period, pushing it back to around September-October.
The operator had already delayed the opening from October 2011, putting it back by seven months over security compliance issues.
It states that, until recently, the airport's planner had been "convinced" that necessary safety requirements would be in place by the June opening date.
But after "several emergency meetings" over the past couple of days, it adds, the project manager concluded that Brandenburg's safety systems would have been inadequate if the date had not been moved.
The transfer of traffic from Tegel and Schonefeld will be temporarily halted, says the operator, while the opening date will be moved to a point "after the summer holidays". It has not given a specific time.