A warning strike by aviation security personnel at eight airports on Tuesday morning led to many cancellations and disruptions.

At the largest hub in Frankfurt, for example, no passengers can board.

An emergency service should only be offered in transfer traffic.

According to the operator, 108 of the 790 planned flights had been canceled by morning.

Severe restrictions were also reported from Berlin and Hamburg.

According to the airport, all 88 planned departures in the Hanseatic city were canceled.

Passengers were asked to check the status of their flights before arriving at the airport.

The airports in Bremen, Hanover, Stuttgart, Düsseldorf and Cologne/Bonn are also affected by the warning strike by the Verdi union.

In the collective bargaining with the Federal Association of Aviation Security Companies, Verdi is calling for the hourly wage to be increased by at least one euro per hour.

Regional adjustments and unified collective bargaining groups could become much more expensive, which, according to employers, would bring up to 40 percent more salary for individual employees.

The employers accuse the union of excess.

After four rounds of negotiations, both sides want to meet again on Thursday in Raunheim near Frankfurt.

Only in Bavaria no strike

The industry criticized the walkout.

Although airports and airlines are not part of the conflict, the strike primarily affects air traffic and many thousands of travelers, said the Federal Association of the German Aviation Industry.

"This is unfair and makes it more difficult for airlines and their employees to revive their economy after the collapse caused by the pandemic," said CEO Matthias von Randow.

A nationwide paralysis of air traffic is disproportionate.

The Federal Association of German Airlines, of which Lufthansa and Condor are members, also criticized the walkout.

Verdi had already carried out all-day warning strikes at several airports last week.

The security checks are under the supervision of the Federal Police and are largely outsourced to private service providers.

Only in Bavaria are inspectors paid according to the collective agreement for the public service and therefore do not go on strike.