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."
The security company that failed to deliver enough staff for the London Olympics has won a new contract with British Airways.
G4S will provide a "range of services" for the airline at Heathrow and Gatwick airports over the next three years.
The firm has had a contract with the airline for more than a decade.
Staff will screen passengers, as well as providing security for buildings and planes.