BBC News
British Airways (BA) has apologised after flights due to depart from the US were grounded for several hours.
The airline said a technical issue that affected some of its long-haul flight planning systems during the night had now been resolved.
BA passengers reported waiting for several hours in airports, with flights eventually departing after long delays.
In a statement in the early hours of Tuesday, BA said: "Our flights due to depart the USA tonight are currently delayed due to a technical issue with our third-party flight planning supplier, which we are urgently investigating."
