More Than 640 Flights Canceled in German Airport Staff Strike

US airports aren't the only ones with current security staffing issues.

At airports across Germany, security workers are on strike demanding better wages. On Thursday, more than 640 flights were canceled across the nation due to the lack of airport staffing, Reuters reports. Security workers walked off the job at Duesseldorf, Cologne and Stuttgart airports.

Officials said that about 61% of flights were affected: Out of 1,054 scheduled flights, a total of 643 had to be canceled. For the remaining flights, the airports warned of significant delays in security lines on Thursday.

A similar strike took place on Monday at Berlin's Tegel airport (TXL), with 1,000 security workers demonstrating for higher wages, causing widespread flight delays and cancellations.

The security workers' union, Verdi, said the employees want a wage increase to 20 euros per hour. Negotiations are set to resume on Jan. 23.