Workers in a small airline in northern China have complained of ‘downtime’ and ‘workouts’ during the past year as they work for a company in the U.S. and other Asian markets.

The China Airline Workers Union said on Monday that some workers have had to work from home because their homes were too cold to operate aircraft.

The union said on its website that some Chinese pilots have complained about being unable to take flight or return home, and some have been able to work even though they could not go to work due to the cold weather.

The airline, which was formed in 2012, said it has been trying to resolve the issues and has agreed to provide pilots with more comfortable working conditions.

The labor union said some pilots had been forced from their homes due to safety and health concerns and said some had been sent home on a daily basis.

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