Greece has been hit by a 24-hour transport strike in the latest protest against government austerity measures.
The government is cutting pensions further and suspending more civil servant posts.
It says this must be done to receive 8 billion euro in aid, the next tranche in a 110 billion euro ($US150 billion) package of loans established by eurozone countries and the IMF to help Greece pay its debts.
Train, bus and taxi services in Athens were crippled, triggering traffic jams and stranding tourists at hotels in the city centre for several hours.
The BBC reports many flights were delayed or cancelled after air traffic controllers walked off the job for several hours in the afternoon.
Some teachers and civil servants also stopped work.