Britain's air traffic authority NATS said it had done enough to fix an earlier system issue for flights to start returning to normal after technical problems delayed planes at Britain's two busiest airports
The expansion of London's Heathrow Airport inched closer on Wednesday when a High Court judge rejected legal challenges from environmental campaigners opposed to the building of a third runway.
The Elizabeth line will connect destinations such as Heathrow Airport in west London to areas such as the Canary Wharf financial district in the east.
A fresh bout of snow on Saturday forced the cancellation of more than 100 flights in and out of London's Heathrow Airport, with a bad forecast threatening further disruption.
British Airways flights were back in the skies on Tuesday but the company faced increasing pressure over its response to the huge IT failure that left 75,000 passengers stranded and dealt a major blow to its reputation.
British Airways said that all its passengers would be flown to their destinations during a 72-hour pay strike by some cabin crew which began on Thursday.
The world's oldest underground rail network takes a big step forward this weekend when the "tube" starts all-night Friday and Saturday services after years of obstruction and delay.