Romanian air traffic controllers are staging a two-hour strike after talks broke down over pay, problems with management and the retirement age.
The strike will begin at 11 am and end at 1 pm (0800 GMT to 1000 GMT) on Wednesday. Some 40 flights will be affected by the walkout at Bucharest's Henri Coanda Airport.
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Some flights have already been canceled.
The union that represents Romania's 1,500 air traffic controllers wants employees to be able to retire at 55, higher pay and a labor agreement that protects all employees.
Negotiations with Transportation Ministry official Dragos Titea broke down Monday.
One-third of flights will operate, according to aviation rules, and flights for senior government officials and the sick will also function.