Heathrow Airport has said that some passengers may have to wait longer to get through security during the Easter holiday period due to the fact that it was unable to strike a deal with security worker unions over pay.
More than 1,400 security officers in the Unite union, who work for Heathrow Airport, are going ahead with a ten-day strike beginning on Friday. Eleventh-hour talks on Thursday broke down without a resolution. At the beginning of the Easter school holidaysEaster school holidays, it threatens to disrupt the UK's largest airport.
Security guards at Terminal 5, which is only used by British Airways, and those who check cargo. Unite has accused the airport of being a real-terms wage cut.
The airport says contingency plans will keep the airport operational. People get away on Easter holidays and the next few days are expected to be very busy. With staffing stretched, getting through security could take longer.
It is expected that the number of security staff at the airport will be reduced on what is expected to be a very busy weekend.
The airport has said it has plans to keep it running as normal, but it is likely that it will take longer to get through security.
Heathrow advises travellers to check the status of their flight before travelling to the airport, arrive at Heathrow no later than two hours before short-haul flights and three hours before long-haul flights, and be ready for security.
The passengers will only be allowed to go through security with two items of hand luggage to help the flow.
The aviation industry is under pressure from the government and industry regulators to avoid a repeat of last year's queues, delays and cancellations, which were largely caused by staff shortages.
A letter to businesses from the Department for Transport and the Civil Aviation Authority has been seen by the BBC, saying it would be unacceptable for consumers to face the same level of disruption this year.
Airlines and airports told the BBC they are confident that they have enough staff in place this time round, even though external factors such as strikes in France affecting air traffic control could cause problems.