Cologne/Düsseldorf – At Cologne/Bonn Airport, a one -day warning strike of the Verdi service union has started. Passengers must expect massive flight cancellations and delays on the second largest airport of North Rhine-Westphalia. The employees of the ground handling are called for strike participation. The Verdi union expects 200 to 300 participants at Cologne Airport. Both airports have connections to Austria that can be affected.