Originally Posted by
TheFifthElement
It's an interesting point. I have a couple of queries concerning the observed flight times assuming the Earth is fixed and not rotating on its axis. Firstly, I'd have thought it would be reasonable to assume that the flight time East-West and West-East would be identical if the Earth was not rotating on its axis. But as we have observed the flight times are not identical. There is a difference of 50 minutes in a flight from Miami to Los Angeles compared to the return flight.
The same marked difference in flight times is not observed, however, on North-South, South-North flights. For example, a flight from London to Johannesburg takes 11 hours 5 minutes whereas the return flight takes 11 hours 20 minutes. A difference of only 15 minutes over a distance of 5617 miles. Can you explain why, in the context of a fixed Earth, flight times differ a greater amount when an aeroplane is traveling East to West or vice versa, compared to North to South?
Secondly, can you extrapolate your explanation of the affect of headwinds on the East-West, West-East flight? What I don't understand is why headwinds affect flights only in one direction, as the advertised flight time for Miami to Los Angeles is always 5 hours 45 minutes, and the advertised return flight time is always 4 hours 55 minutes, assuming we are looking at direct flights. Is wind affect predictable because the Earth is fixed? This does not appear to correlate with my own observational experience. For example, where I live today there is no wind, but two days ago there was a strong North wind. So, why does is the flight time not exactly the same, with some margin for error either way due to unpredictable weather conditions?