FILE- This April 16, 2015 file photo shows an India's budget airline IndiGo aircraft approaching for landing at the Indira Gandhi International (IGI) airport in New Delhi, India. Indian budget airline IndiGo finalized an exceptionally large order for 250 single-aisle Airbus A320neo jets on Monday, Aug. 17, 2015 to keep up with rapid growth in the country's air travel.