Athens - A brief strike by air-traffic controllers at Athens International Airport forced the cancellation or rescheduling of 35 flights Wednesday.
The debt-ridden state carrier, Olympic Airlines, said it would cancel 20 mostly domestic flights as a result of the three-hour stoppage, which starts at noon (0900 GMT).
Another 15 flights, including ones to London and Paris, are being rescheduled at Greek private carrier Aegean.
A nationwide strike has also been called by Greece's main public sector union ADEDY, forcing universities, tax offices, public schools, municipal offices and pharmacies to remain closed for the day.