UK flight delays glitch 'now fixed' but delays continue
A telephone glitch that caused hundreds of flights to be delayed has now been resolved, but disruption is continuing.
Thousands of passengers faced cancellations and long waits after the National Air Traffic Service (Nats) internal phone system broke down.
Affected airports included Heathrow, Gatwick, Stansted, Cardiff and Glasgow.
Nats announced at 1930 GMT that the problem had been fixed, but some airports said delays could continue into Sunday.
A passenger who said he had been waiting five hours at London's Gatwick airport earlier told the BBC that people had been "crying, distraught and angry".
"One passenger has missed their sister's wedding," Tom Flatman, from Brighton, said.
By 16:00 GMT Nats said it had handled 2,576 flights compared with 2,905 at the same time last week.
Ryanair said 300 of its flights were delayed on Saturday with 12 cancelled, and called on the Civil Aviation Authority (CAA) to act.
"While we acknowledge problems can occur, where is the contingency?" it said in a statement.
Heathrow had cancelled 228 flights by 18:55 GMT, a spokeswoman said, adding that there was now an average one-hour delay for departures.
By Saturday evening Gatwick airport said it was "returning to normal operations". A spokeswoman said it was "not expecting serious disruption" on Sunday.
Delays at Stansted averaged two to four hours, a spokeswoman for the airport said, adding that schedules were expected to return to normal on Sunday but warning there could be "minor delays".
No Easyjet flights have yet been cancelled but many were subject to delays.
Eurocontrol - which manages European air safety - said around 1,300 flights, or 8% of all air traffic on the continent, had been "severely delayed".
- A spokesman said Manchester Airport had been "only minimally affected" and operations were now back now back to normal
- Leeds Bradford, Doncaster Robin Hood and Newcastle airports all reported minor delays, with flights to London worst affected
- Belfast International Airport and Dublin Airport reported a number of cancellations
- A spokeswoman for Birmingham Airport said around 60 flights were affected, the majority were delayed by under an hour
Nats said the problem at its Swanwick centre, in Hampshire, arose in the early hours of Saturday morning when the night-time operation failed to properly switch over to the daytime system.
"The problem that arose this morning with the ground communications system in the area control operations room at Nats Swanwick has now been resolved and operations are returning to normal," a spokesman said.
Biggest in Europe
The software failure happened when the 23 controllers working overnight were due to hand over to the 125 on the day shift at around 06:00 GMT.
"To be clear, this is a very complex and sophisticated system with more than a million lines of software," the spokesman added.
"This is not simply internal telephones, it is the system that controllers use to speak to other [air traffic control] agencies both in the UK and Europe and is the biggest system of its kind in Europe."
The BBC's transport correspondent Richard Westcott said it was a totally different issue to a software problem that hit the control centre in summer.
Nats head of operations Juliet Kennedy told the BBC: "We want to apologise to people. We are very aware of how much inconvenience this has caused people."
The CAA advised customers affected to contact the airline concerned to discuss their case.
It pointed out that customers could claim assistance from their airline if they were delayed for several hours, including being given food and drink, usually in vouchers.
At Stansted, Alena Kontza was stuck on a Ryanair plane that had been delayed for three hours. She told the BBC passengers had been given "absolutely no information" and "it's been nothing less than shambolic".
"People are really aggravated, children are crying, people want to leave, people want to change to different planes, it's an absolute nightmare," she said.
A spokeswoman for British Airways said: "We are organising hotels for customers when appropriate. In addition, customers on cancelled services of course have the opportunity to claim a refund or rebook."
Independent aviation analyst Chris Yates said it had been a "trying and a very tough day", adding: "There's going to be a lot of hard questions asked of Nats over the coming days.
"In the meantime we have to get back to a normal service."