A security personnel strike at Frankfurt Airport canceled 65 flights on Friday as of 5 p.m. local time.
Verdi union representatives said the strike has been running since 0100 (UTC) and would end at 2200 (UTC), 2300 local time.
The situation turned chaotic Friday afternoon when airport operator Fraport halted security checks and urged passengers not to come to the airport because there would be no chance they would make their flight. As a result, many aircraft left the airport empty because passengers could not make their way through security lines.
However, transfer passengers were able to connect to flights in Frankfurt and were less affected by the strike.
Verdi is demanding a standard hourly pay rate of €16 ($22.01) for security employees in the regional state of Hesse. The union said employees were offered between €10 and €13 an hour. Security employees in other states get up to around €15 an hour, it said.