Globe Ground employees pass by waiting travelers during a warning strike at the Tegel airport in Berlin, Germany, Tuesday, March 27, 2012. Hundreds of flights have been canceled as workers at several German airports have joined other public employees staging short-term warning strikes in a pay dispute. The ver.di union wants a 6.5 percent increase this year for 2 million federal and municipal government employees. It has rejected a 3.3 percent increase over two years.(AP Photo/Michael Sohn)