An Air France plane bound for Washington, is guarded by...

An Air France plane bound for Washington, is guarded by Police officers at Roissy airport, North of Paris. (Dec. 30, 2009) Credit: AP

Beginning Feb. 1, obese passengers on Air France flights who don't reserve a second seat may not be allowed to board their flight if there is not an unoccupied adjoining seat in the aircraft.

"It's a question of security," spokesman Nicolas Petteau said.

The company, which has long offered obese passengers the option of buying an adjoining seat at a discount, said passengers would be fully reimbursed for the second fare in 90 percent of cases if the plane isn't full.

Other airlines with similar policies on obese passengers include Southwest, JetBlue and American Airlines.

MORE: Read Newsday's "Dropping LBs" series on weight-loss success stories

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