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."
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Hundreds of passengers were ordered to leave the terminal building and flights grounded after passengers suffered difficulties breathing.
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An eyewitness said: "It was very unnerving. It was just after 12pm and there were suddenly police vans and cars everywhere."