British and U.S. agencies are investigating alleged price-fixing by British Airways and other airlines on passenger fares and fuel surcharges, BA said Thursday.
In a brief statement, BA said it was assisting the Office of Fair Trading and the U.S. Department of Justice with their investigations, but it provided no details.
Two other airlines - Virgin Atlantic and American Airlines - said they were cooperating with the investigation.
BA said Martin George, its commercial director, and Iain Burns, its head of communications, have been given leaves of absence during the probe.
The Office of Fair Trading confirmed that an investigation was under way but gave no details.
Paul Charles, director of communications at Virgin Atlantic, said: "We're aware of the investigations and we're assisting with inquiries" from the two agencies.
Charles declined to say whether Virgin Atlantic was being investigated but said none of its staff had been placed on leave.
AMR Corp.'s American Airlines said in a brief statement that it "has received a United States federal grand jury subpoena in connection with a government investigation into alleged price fixing in the air passenger industry. The airline has been informed that the company is not a target of the investigation."
A United Airlines official in England said questions regarding the probe had to be referred to the airline's home office in the United States.
Nick Britton, a spokesman for Continental Airlines, said he was not aware of the airline's involvement in the probe but was checking with the company's home office in Houston, Texas.
Six other airlines - Ryanair, bmi, Lufthansa, Finnair, KLM and SAS - said they were not being investigated.
BA shares tumbled 4.9 percent to 349.75 pence ($6.45) on the London Stock Exchange.
In February, more than a dozen airlines were drawn into an investigation by U.S. and European Union officials of suspected collusion in the air cargo industry to fix prices on surcharges for fuel, security and insurance.
European and U.S. officials refused to provide details about the probe. But one of the foreign airline's targeted, SAS AB's SAS Cargo in Copenhagen, Denmark, said the EU has alleged that cooperation among airlines began in 2000 and involved agreements about surcharges imposed by airlines to offset certain external costs.
BA confirmed at the time that it had received a request for information from the Commission and the U.S. Department of Justice "relating to alleged cartel activity involving BA and a number of other airlines and cargo operators."
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The suit follows BA's admission last week that antitrust regulators are probing the carrier's pricing policies.
Several major airlines and cargo specialists have been contacted by the US Department of Justice during the investigation so far.
The settlement is subject to court approval and would release the airline from the pending class actions.