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An airplane seat, a fuel slick and pieces of white debris scattered over three miles of open ocean marked the site in the mid-Atlantic on Tuesday where Air France Flight 447 plunged to its doom.Brazilian military pilots spotted the wreckage, sad reminders bobbing on waves, in the ocean 400 miles (640 kilometers) northeast of these islands off Brazil's coast. The plane carrying 228 people vanished Sunday about four hours into its flight from Rio de Janeiro to Paris.The effort to recover the debris and locate the all-important black box recorders, which emit signals for only 30 days, is expected to be exceedingly challenging.Brazilian military pilots first spotted the floating debris early Tuesday in two areas about 35 miles (60 kilometers) apart, said Air Force spokesman Jorge Amaral. The area is not far off the flight path of Flight 447.The cause of the crash will not be known until the black boxes are recovered