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Fascinating tidbit:

> A helicopter will not come when it’s above 120 degrees outside.

Heat directly affects flight. Hot air is less dense and provides less lift. It's kinda obvious in retrospect, but I had no clue!

Not that they'd use airplanes as an alternative to rescue lost hikers, but just in general does the same issue affect airplanes?

Indeed

If you care to research further, the search term for aviation information would be "density altitude"