Adrian Tighe, managing director of G4S Transport and Borders (UK), said:
"We havebeen working closely with British Airways for over a decade and are delightedto be continuing our long-standing relationship as an integral part of theirsecurity arrangements.
"Thiscontract will allow us to work in partnership with BA developing improvedprocesses and enhancing levels of customer service."
More top news
Londoners who have received new electronic gadgets for Christmas are being advised to take simple steps to protect them from thieves.
The Boxing Day sales got off to a flying start with shops reporting a surge in business during the first hour of trading.
Bus strikes are planned for Monday 29 December and Monday 5 January.