FILE - In this Feb. 8, 2017 file photo, members of the airport ground staff stand at Schoenefeld airport in Berlin, during a warning strike. A union representing ground staff has called on its members to go on strike at Berlin's two airports and warned the walkouts might lead to delays and perhaps flight cancellations. The ver.di union says the strikes would begin Friday at 4 a.m. (0300 GMT) and end Saturday at 5 a.m. (0400 GMT) at the German capital's Tegel and Schoenefeld airports. (Paul Zinken/dpa via AP)
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