Having improved upon the Boeing 747-100, 200, and 300, Boeing was determined to improve the latest version of its jumbo jet. The Boeing 747-400 would have newer, more efficient engines that would cut fuel burn by 10% and increase the range of 1,000 nautical miles. Minnesota-based Northwest Airlines became the first customer, entering the plane into service at Minneapolis–Saint Paul International Airport (MSP) on February 9, 1989.
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