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It was the last passenger 747 flown by a U.S. carrier. The plane, once called the “Queen of the Skies,” is becoming a white elephant as airlines opt for more fuel-efficient two-engine models and jets with fewer seats, like the Airbus A350 and Boeing 787. The 747 has a history as a workhorse of commercial aviation, but what many people don’t realize is how big a bet Boeing made on this jet — a bet
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