This is an old revision of the document!
Sometimes it is hard to believe that the winds can have that much effect on the flight time. Some flights can be around 25% shorter when flying east than flying west. For example, flying from New York to Amsterdam can take around 8 hours and 45 minutes (at the speed of 400 knots/h), while flying from Amsterdam to New York can take around 9 hours and 30 minutes (at the same speed).
We have implemented average winds into Leon, so now the system suggests 2 STA times (apart from the one based on historical flights):