India’s IndiGo is the fourth most ‘mega carrier’ in the world, beating British Airways and Lufthansa in a travel analyst company’s annual list. Japan Airlines takes the top spot in OAG’s list of the world’s most punctual ’mega carriers’. Its annual review, the Punctuality League 2018, takes into account airlines’ performance on timekeeping. OAG has two separate punctuality lists, one for all airlines, big and small, and another one for ‘mega carriers’. The company defines ‘on-time performance’ as flights that arrive or depart within 14 minutes and 59 seconds (under 15 minutes) of their scheduled arrival/departure times.