Passengers at Heathrow airport may escape the feared delays forecast this weekend as families return from the half-term break, Sky sources have said.
Sky's home affairs correspondent Mark White had said there were worries travellers would be forced to wait several hours before getting through immigration because of apparent staff shortages.
He said: "This has all the potential to be a very difficult weekend for passengers.
"The airlines at Heathrow have issued an urgent bulletin to staff saying they're expecting delays of up to three hours.
"It's a combination of half-term holidaymakers returning to Heathrow but also apparently lower staffing levels at immigration checkpoints."
But so far, reports suggest the airport is running "better than normal".
British Airways had warned that congestion was building up in the immigration area of Terminal Five.
A BA spokeswoman said: "We are speaking to Heathrow Airport and UK Border Agency to understand why the immigration area in Terminal Five is congested.
"We are doing all we can to assist our customers and are sorry that they are being affected by this issue, which is regrettably beyond our control."
A spokesman for Heathrow added: "No one has notified us of a staff shortage. However, it is up to UK Border Agency to staff the border appropriately."
Despite the concern, the UK Border Agency released a statement saying: "There will be a significant number of passengers coming through UK border controls and we have organised extra resources to ensure that we have sufficient staff to process passengers as quickly as possible, while maintaining border security."
It added that it was expecting "an exceptionally busy weekend as usual for the end of February half-term".
White said if passengers were forced to queue at immigration, it would have a knock-on effect on incoming flights.
"Some may have to circle around Heathrow for longer and some may have to be diverted to other airports," he said.