A strike and work slowdown at Istanbul's main airport has forced Turkish Airlines to cancel more than 100 flights.
Ground handlers, technicians and other workers are protesting a government-proposed legislation that would ban future strike actions by aviation workers.
Binali Yildirim, the country's transport minister, says Turkish Airlines was forced to cancel 104 domestic or international flights on Tuesday while several other flights have been delayed. Private HaberTurk television is reporting long lines and chaos at Istanbul's Ataturk International Airport.
An aviation workers union says the proposed legislation violates international labor laws and is unconstitutional.
The protest is expected to end on midnight Tuesday.