Despite being retired by many former iconic operators, the long-tenured 'Queen of the Skies' is still a fixture in global airspace and airfields alike. Although retirements have been initiated and completed by many airlines worldwide, many continue to offer a premium product onboard the Boeing 747. Aside from cargo and charter operations, the number of commercially configured examples is present only in four carriers' fleets. The upper deck of the 747 is commonly configured as a premium cabin because it is physically separate from the rest of the cabin. Additionally, the upper deck is generally stacked vertically on top of…