For more than half a century, the Boeing 747 has ruled the long-haul skies. With its pronounced upper fuselage, four powerful engines, and enormous range, it became one of the most recognizable aircraft ever built. Generations of travelers crossed oceans aboard what many proudly called the “Queen of the Skies.” But time moves on in aviation. Most passenger 747s have now been retired, replaced by more efficient twin-engine widebodies. Today, only a handful remain in passenger service worldwide, a...