Southwest Airlines might have to put its expansion plans on the back burner to concentrate on repairing and replacing its aircraft after finding cracks in some of its older planes, according to some analysts. "They can't replace a large number of planes at a time so growth expansion plans may get kicked in the pants," says airline consultant Robert Ditchey. But Southwest says its growth plans remain on track, and the company is replacing older 737 jets with newer models, including the larger, more fuel-efficient 737-800.

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