Airlines around the world are following Boeing's recommendation to inspect older 737s for tiny cracks that could weaken the fuselage and cause a mid-air rupture in the plane's skin. Regulators in Asia have followed the U.S. lead in requiring stepped-up inspections for 737s that have operated more than 30,000 flight cycles, and some experts believe the U.S. order could be extended to additional models as the investigation continues into last week's incident involving a Southwest Airlines jet.

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