Updated

Flights in Greece have been halted for four hours as the country's two largest labor unions staged work stoppages to protest austerity measures and the government decision to cancel a teachers' strike.

Flights are being grounded between 12:00 and 4:00 p.m. (0900-1300 GMT) Thursday as air traffic controllers joined the protest called by labor unions GSEE and ADEDY.

The government this week issued an emergency order to force high school teachers to work through the May 17-31 university entrance exams and cancel plans for rolling strikes. It was the third time the conservative-led government used the emergency civil mobilization order to end a strike this year.