A majority of flights were grounded at the Duesseldorf and Cologne Bonn regional airports in Germany after the Ver.di trade union called for a 24-hour strike, Reuters reported.

Only 89 of the planned 330 flights at Duesseldorf Airport were operational, and 29 flights were diverted to other airports.

The airport noted that seven flights have been rescheduled for the next day, according to the news agency.

However, only two flights out of the 136 daily passenger flights were operating as scheduled on Monday at the Cologne Bonn Airport.

The German trade union called for a 24-hour strike on Friday after public service workers and aviation security workers failed to reach an agreement.

A Ver.di spokesperson at Cologne Bonn Airport was quoted by the news agency as saying: “If the employers continue to be obstructionist and do not present us with results, then the reaction of the employees here is clear.”

The two German airports, which serve Lufthansa, Turkish Airlines and Aegean Airlines, informed the passengers about the strike well in advance to change their plans accordingly.

Earlier this month, Ver.di asked personnel working at various German airports to go on a 24-hour strike on 17 February over demand for pay hikes.

The objective of this strike was to help these workers secure increased wages to cope with the higher cost of living.

It said that the 24-hour strike would impact operations at various airports across Germany, including Frankfurt/Main, Munich, Stuttgart, Hamburg, Dortmund, Hanover and Bremen airports.