Indian budget carrier IndiGo placed a $20 billion order (at list prices) for CFM International Leap-1A engines to power 280 Airbus A320neos and A321neos on the opening day of the Paris Air Show, marking CFM's largest single engine order. The airline will take delivery of its first Leap-1A-powered A320neo in 2020. Its contract also includes spare engines and an overhaul support agreement, as well as a long-term service agreement for the engines.

IndiGo is the largest customer for Pratt & Whitney GTF engines for Airbus 320neos. Following initial issues with the GTF, IndiGo suffered a large number of grounded aircraft, but acknowledged it received compensation from Pratt & Whitney for the AOGs.

The airline presently operates a fleet of 17 A320ceos powered by CFM56-5B engines, part of a total fleet of 215 A320/A321 family aircraft. Fast-growing IndiGo has a fleet of more than 230 aircraft, with around 1,400 daily flights, 54 domestic destinations, and 19 international destinations.