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19. Avis Budget Group
Fortune 500 rank: 411
2007 loss: $916 million

The global leader in the auto rental market is still trying to emerge from the broken-up Cendant conglomerate in one piece. Rental revenues were up last year, despite a tough leisure travel environment. But costs rose thanks to a $1.2 billion loss in the value of its brands and higher prices for cars charged by Detroit's Big Three.

The company aims to grow its off-airport rentals to better compete with Enterprise, its biggest competitor.

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Last updated April 24 2008: 11:01 AM ET