In 1980, Pan Am significantly upgraded its first class cabins on its Boeing 747 and 747SP aircraft by introducing Sleeperette ...

Ever since it first took to the skies (with passengers) in January 1970 with launch customer Pan Am Airways, the 747 has cemented itself ... that led to a dearth of orders. The initial 747-100 variant ...

If not already evident, the Boeing 747-100 was the first generation 747 that Boeing delivered to its initial set of customers, which included Pan Am, Saudi Arabian Airlines, and Kalitta Air.