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Winds can have 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).
Responding to the expectations of our clients we have implemented average winds into Leon, so now when you add a new flight (either from 'New Flight' or 'Planned Flights' sections) the system suggests 2 STA times (apart from the one based on historical flights):
and