Belgium has closed its airspace for 24 hours during a nationwide strike.
The industrial action, which continues to Wednesday night, is also affecting police, hospitals, buses and trains.
All flights in and out of Belgium have been canceled until Wednesday night as public transport workers went on a 24-hour strike.
All sectors, from public transport to rubbish collection, postal services, hospitals and commercial centers have been affected.
Belgium's air traffic control authority said on Tuesday it was forced to close the country's airspace between Tuesday 10 p.m. CET (2100 UTC) and the same time on Wednesday.