According to German media, the boss of the airport in Germany blamed the chaos on black suitcases.

Passengers were advised to use suitcases that are easy to spot by the head of the airport. He said it's difficult to distinguish black suitcases from each other.

"Many people travel with black suitcases on wheels and it's difficult to identify them," said Thomas Kirner, a spokesman for the airport.

During the Pandemic, the airport slashed 4,000 jobs and is struggling to deal with a surge in air passenger demand. The company only rehired 1,000 new ground service staff so far.

There were expected to be disruptions at the airport for the next two to three months due to staff shortages. There were some 2,000 suitcases that were stuck at the airport.

The aviation sector is dealing with a messy summer travel season with flight delays, lost bags, and chaos as demand has returned to pre-pandemic levels.

Industry participants have blamed each other.

The CEO of Swissport slammed governments for their "invented political science" that led to massive layoffs. "After the massive job cuts that were absolutely necessary at the time, there is now a lack of staff everywhere," Brady was quoted as saying.

The chairman of London Heathrow Airport hit back at airlines that had blamed the airport for the travel chaos. The number of passengers that can be flown out from the facility each day has been criticized by airlines.

Lord Paul Deighton, the chairman of the Heathrow Airport, wrote in the Telegraph on Tuesday that over half of ground handlers have left the industry because of the swine flu.

If airline customers don't pay market rates, ground-handling companies can't fill the posts.