Did you know: planes fly east faster in the west, and this is the reason

At the same distance, the same plane has the same cruising speed but different departure points and the destination has different flight times. Specifically, flights from New York to Los Angeles usually take about 6 hours while reverse flights from Los Angeles to New York are faster than 40 minutes.

1. Why often have white smoke streaks in the sky after the plane flies over?
2. Harmless effect if sleeping when the aircraft took off and landed
3. Why are there so many planes in the sky at the same time but they never collide with each other?

Why is there a different flight time? Check out the video below to get an answer.