Authorities say a volcanic ash cloud sweeping across Europe will continue to disrupt air travel this weekend.
Analysts estimate the chaos is costing the industry some 150 million euros per day.
Air traffic controllers say 28,000 flights normally operate daily in Europe. Just 11,000 took off on Friday.
A volcano in Iceland erupted on Wednesday, spewing out an ash cloud that is drifting eastwards across the continent.
Euronews correspondents at Brussels Zaventem airport and London Heathrow said check-in areas were completely deserted as officials cancelled all flights.
The shutdown of northern Europe’s airspace is also having a knock-on affect across the continent. There were bottlenecks at Istanbul airport on Friday where passengers face at least another 24 hours of delays.
National carrrier Turkish Airlines cancelled more than 80 flights to 14 countries over safety fears.