Originally Posted by SkyBuck
If you are on the nonstop, JFK-DTW is 2hrs 7min and DTW-JFK is 1hr 45min, plus or minus 5 minutes depending on time of day.
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Huh? JFK-DTW is a non-stop of approximately 500 miles. Flying east, with a tailwind, can result in a flight of little more than an hour.