Up to half of all flights in Europe face delays today after a Europe-wide air traffic control system failed.

Eurocontrol, which runs the system, said that a technical problem means that as many as half a million passengers could be affected, disrupting travellers who went away for the Easter weekend. 

'Today 29,500 flights were expected in the European network. Approximately half of those could have some delay as a result of the system outage,' Eurocontrol said. The agency said the system would be back up and running tomorrow. 

London's Gatwick Airport said seven or eight flights an hour were being delayed as a result and told passengers to check with their airlines.

Eurocontrol - which covers 41 countries including all 28 EU nations plus others in Europe including Ukraine, Turkey and Norway - said it hoped to have the system back up and running by tomorrow.

The cause had been identified, it said, without saying what it was. The agency said 'contingency procedures' were in place to stop the system becoming overloaded but that these would be lifted later this evening. 

Eurocontrol added that flight plans from before 11.26am BST were 'lost' and asked airlines to refile them.

The agency said it was a 'technical fault' and that the system had not been hacked, saying they were now 'in recovery mode'. 

Some 59 per cent of departing flights at Gatwick were delayed between 3pm and 4pm, according to airline data company FlightStats. 

Gatwick said it anticipated traffic would be back to normal later this evening.

A spokesperson for Gatwick said: 'Following a failure of Eurocontrol's Enhanced Tactical Flow Management System (ETFMS), and associated flight plan system, some flights in and out of London Gatwick are experiencing delays.

'Passengers are advised to check with their airline for the latest information on flights and we apologise for any inconvenience that this may cause passengers.'

Several airports across the continent warned of problems, with Amsterdam's Schiphol saying that the 'system failure' at Eurocontrol could have 'possible consequences' for departures.

Toan Ravenscroft said: 'Currently on the runway with a full plane and a grumpy 19 month old, only to be told issues mean at least an hour sitting here.' 

Rachel Waterman tweeted: 'Settling in for a 6 hour delay as European Air Traffic Control has crashed. Sorry to be that person but has anyone tried turning it off and turning it on again?.'

EasyJet passenger Caoimh Smith said: 'Sitting very frustrated at Lyon airport waiting on information for a delayed flight to Gatwick.' 

Another Twitter user said they were...read more at Daily Mail