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The first 747-400 was rolled out in January 1988 and flew for the first time on April 29, 1988. Certification was received on January 10, 1989 with Pratt & Whitney PW4000 engines, May 18, 1989 with General Electric CF6-80C2s and June 8, 1989 with Rolls-Royce RB211-524Gs. The first 747-400 was delivered to launch customer Northwest Airlines on January 26, 1989, with service entry on February 9 with a flight from Minneapolis to Phoenix.[7]

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