Surprise strike at Germany's Hamburg Airport affects more than 40,000 passengers

People queue in long lines in departure hall C at Rhine-Main Airport, Frankfurt, Germany on Sunday, a day ahead of a planned strike across Germany amid new contract negotiations.

The walkout, which reportedly took place with only about a half-hour advance notice, came before a broader series of preannounced strikes across 13 airports in Germany on Monday.

(Image credit: Andreas Arnold)