I am interested in flight departures from Heathrow London.
After comparing the results from the API (https://flightxml.flightaware.com/json/FlightXML3/AirportBoards?airport_code=EGLL&offset=15) to Heathrow’s own website (https://www.heathrow.com/departures) it seems that every
filed_departure_time is off by 10 minutes.
For example: according to the API CPA250 / CX250 is scheduled to depart at 6:30pm, however Heathrow and Google says it departs at 6:20pm.
This behaviour can be seen for all the flights I manually checked.
While this persist, we will not be able to use the API as customers would potentially get very confused about their flights.