"We want to stick with our planned expansion of flights from Berlin," a spokesman for Germany's biggest airlines said in a statement on Tuesday.
The airport operator said earlier the opening of Berlin's new airport, scheduled for June 3, will be delayed until after the summer due to problems with fire safety.
Lufthansa (LHAG.DE) has said it plans to increase fourfold the non-stop routes to European and Middle Eastern destinations its main carrier offers from Berlin.
"We have noticed in test runs over the past days and weeks that there is still need for action on many matters. It is important for us that smooth flight operations can be ensured at the new airport," the spokesman for Lufthansa said.
(Reporting by Maria Sheahan)
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