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Flying Time Calculation

1
Note down the departure and arrival times.  Write down the times on a sheet of paper using the local times for the airport. For example, if you depart from New York City, you would write the time as it was in the Eastern time zone. If you land in California, you would list the time as it was in the Pacific time zone.[5]
Arrivals and departures posted at the airport are usually in the time zone for the local airport.

2
Convert the times so they are in GMT.  Greenwich Mean Time, or GMT, is the standard time in London and never changes for Daylight Saving Time. Every other time zone is behind or ahead of it depending on how far west or east you travel respectively.[6]
For example, New York City is -5 hours from GMT. If you depart at 6 AM, add 5 hours to convert it to 11 AM GMT. The state of California is -8 hours from GMT, so if you arrive at 9:30 AM, you would add 8 hours to get 5:30 PM GMT.
Find the GMT times for each time zone online or use an online calculator to help you.

3
Calculate the difference in arrival and departure times. Count how many hours are in between the estimated arrival and departure to get an estimate of how long you will be in the air. If you're using military time, simply subtract the time you depart from the time you arrive.[7]
For example, if you leave New York at 11 AM GMT and arrive in California at 5:30 PM GMT, you would be in the air for 6 hours and 30 minutes.
Know that the flight time is an estimation since it does not account for any wind or severe weather.

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