Back when a commercial flight was still a big deal, a rare , Pan American World Airways commemorated a passenger’s crossing the equator with a little memento. Navy guys will recognize it, it was inspired by the Shellback Certificate

On April 25, 1948, Sylvester “Steve” Wittman was accepted into the “Empyrean Realm of His Exalted Majesty Jupiter Rex,” 

 Pan Am felt that its passengers making the same journey in the air deserved to be celebrated.

 https://inspire.eaa.org/2024/10/24/eaas-attic-steve-wittmans-pan-am-passenger-certificate/

https://inspire.eaa.org/category/history/