More space = More cash

United Airlines, a unit of UAL Corp, will require obese passengers bumped from full flights to purchase two seats on a subsequent flight, matching the policy of some other carriers.

The change brings the Chicago-based in line with eight other airlines including Continental, Delta, JetBlue and Southwest, United spokeswoman Robin Urbanski said on Wednesday.

"Last year we had 700 complaints from passengers who had to share their seats," she said.

Under the new policy, obese passengers -- defined as unable to lower the arm rest and buckle a seat belt with one extension belt -- will still be reaccommodated, at no extra charge, to two empty seats if there is space available.

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