British Airways is working to fix a “technical issue,” according to a spokesperson for the airline on Monday, as reports emerged on social media of flight delays and IT issues with the airline.

British Airways passengers suffered delays following a systems outage at the airline’s main operations center in Heathrow that prevented communication with aircraft across the region.

A reported major IT glitch for British Airways has meant pilots were unable to file flight plans electronically, and had to manually call into the operations centre at Heathrow