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<p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal">UnitedAirlines（联合航空） is betting big on the future of air travel—and that’s good news foreverybody from plane manufacturers（制造商） to other airlines and the traveling public.</p><p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal">Atits investor day Tuesday, United announced（宣布） a huge order for 200 Boeing 737 MAXjets and 70 Airbus A320 planes. The order, with a list price of roughly $27billion, is the largest in the company’s history and the largest by any carrier in a decade, according to the airline.</p><p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal">Forthe record, United Airline ended 2020 wi...