The U.S. military has a reputation for keeping aircraft in service far beyond their original design life.
Fleet
IndiGo Airlines (6E), India’s largest airline since 2006, grew from a domestic low-cost startup to one of the largest global carriers in less than two decades.
Go First fleet is largely grounded due to problems with the engines. Only 31 of the 59 Go First aircraft are active, according to the fleet tracking website, and 28 are parked.