An air traffic control problem has hit hundreds of flights in northern European airspace.
Germany, Belgium, the Netherlands and Luxembourg were among the countries affected on Friday.
The problem was centred on the Eurocontrol radar system, based at Maastricht in the Netherlands.
Eurocontrol later confirmed the system had returned to normal capacity, but said the backlog of flights would mean delays continuing into the evening.
Eurocontrol said "equipment problems" affected its air navigation services for flights in airspace above 7500 metres. About 700 flights were affected.
Some delays were reported to flights and from Britain, but the BBC reported no major problems.