Southwest Airlines says it finished inspecting its grounded older planes and five of them have cracks in the aluminum skin.
The airline said Tuesday that its operations were returning to normal after nearly 700 flights were cancelled Saturday through Monday.
Southwest grounded 79 older Boeing 737-300 planes after a similar jet sprang a hole in the roof Friday on a flight from Phoenix.
Federal officials say they will order emergency inspections of some older 737s for cracks in the fuselage like the ones on the Southwest jets.
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