Japan Airlines tops the 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. The company said in a press release it ranked the airlines based on its extensive database of schedules of more than 900 airlines and over 4,000 airports .
Indian carrier Indigo made it to the list of 'mega carrier' with top fourth position, beating British Airways and Lufthansa.
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.