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What Is The Boeing 747SP, The Short And Stubby Wide-Body Jet?Its four Pratt & Whitney JT9D-7R4W or Rolls-Royce RB211-524C2 turbofan engines gave it the 747SP a cruising speed of Mach 0.88, but it could fly as fast as Mach 0.92 with 46,500 pounds of force.
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