Why Did Airbus Build The A380 With Two Decks?

In 2007, the world’s largest commercial aircraft, the Airbus A380, entered service with Singapore Airlines. Airbus had taken the engineering leap that the Boeing 747 Jumbo had never fully realized and built a double-deck aircraft in which the upper deck stretched the entire length of the plane. While there was much enthusiasm at the time of its launch, it soon became clear that the aircraft was unpopular. Sales were slow, and the program was terminated in 2021, with only around 250 examples delivered.