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    This begs the question why aren’t all time slots for take off and landing booked in UTC? Worst case is that local times will shift, but flights will always be the same length and they won’t have to rearrange slots.
    – Darren
    Commented Sep 29, 2023 at 7:21
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    @Darren: Because locals -- and local flights -- don't give two figs about UTC. They think local time, they use the local time in their daily life, they book meetings and taxis in local time, etc... Commented Sep 29, 2023 at 7:39
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    @Darren And even if you did schedule the slots in UTC, you'd still have to change the slots at the beginning and end of the day because noise management rules and airport opening times tend to be in local time, and that cascades across the day. Commented Sep 29, 2023 at 15:13