The FAA today plans to issue an emergency inspection order for certain older-model Boeing 737s to look for evidence of fuselage cracks. There are about 175 of the planes in use worldwide, with 80 registered in the U.S. Some safety experts said the order might eventually be broadened to include more aircraft, and Transportation Secretary Ray LaHood warned of possible "additional action depending on the outcome of the investigation" into Friday's incident involving a Southwest Airlines 737-300.

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