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Federal safety officials said Monday they are ordering additional inspections of some Boeing 737 jets after a hole tore open in a Southwest Airlines plane during flight in 2009. The Federal Aviation Administration said that it will seek more detailed inspections for cracks along the tops of the planes. The FAA estimated that the cost of inspecting 109 older Boeing 737s will be about $5.2 million. The agency said it has no idea how many planes will need repairs.The order will cover 737-300, -400 and -500 models of the popular passenger aircraft. Southwest's entire fleet is Boeing 737s, although many are newer -700 and -800 models. The agency said repairs could cost up to $17,765 per plane, or $1.94 million for all 109 U.S.-registered planes covered by the order.