FlyerTalk Forums - View Single Post - AF4091 and AF4095 flight numbers: why?
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Old Aug 28, 2019 | 3:35 pm
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BA6501
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19:00 JFK is 23:00 UTC (same day). 21:45 JFK is 01:45 UTC (next day).

These things are measured in UTC, not local time, for operational/ATC purposes.

That said, these things are also measured in local time for staff/pax/website purposes. Which is why the later flight was also renumbered.
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