Dozens of BA flights have been grounded and communications lost after a major IT glitch hit company software, causing chaos for thousands of passengers.
Hundreds of passengers have been seen standing in the cold waiting to board their flights, while others have been stuck on planes awaiting clearance to take off.
The IT issue meant that pilots were unable to file flight plans electronically and had to manually call into the operations centre at Heathrow.
Pilots have also been unable to…
