ATHENS, Greece (AP) — Flights in Greece were halted for four hours Thursday as the country’s two largest labor unions staged work stoppages to protest austerity measures and a government decision to cancel a teachers’ strike.

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