Flights into London have been delayed this morning as monitoring systems at National Air Traffic Control (NATS) failed.
Systems briefly failed with flight details consequently inputted manually.
The fault was corrected at 09:00, with flights at Heathrow Airport and Stansted Airport now returning to normal.
Planes were delayed on approach.
However, most delays were believed to be less than hour, NATS said.
“Some disruption to departing and arriving flights is occurring due to an earlier technical problem with the London area air traffic control system,” read a statement from Heathrow earlier.
“Passengers travelling from Heathrow are advised to check-in as normal.
Gatwick, London Luton and Stansted airports said the problems had also affected some of their flights.
A NATS spokeswoman told the BCC in the UK the back-up system for processing flight plans was a “much slower process” and said they “regretted” any delays caused.