The opening of Berlin's new airport, scheduled for June 3, will be delayed due to problems with fire security, German media reported on Tuesday, citing local government sources.
The reports did not give a new opening date for Berlin-Brandenburg Airport, which aims initially to attract up to 27 million passengers annually.
Lufthansa and Air Berlin plan to expand services and routes at the new airport, which is built on the existing Schoenefeld site in Germany's capital.
Schoenefeld and Tegel are to shut shortly. Together they handled 24 million passengers annually, fewer than half the number at Germany's main airport in Frankfurt.