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I believe BHM is a special-qualification airport due to terrain in the area. You don't have to have Aspen-like mountains nearby ... just hills, particularly in proximity to the runway ends.
FL270
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Correcto!
Which is kind of hilarious because since for so many years we were a 'flatlander' airline, we've got all of these loads of procedures for flying into areas with terrain features.
I think we've got 9 'green pages' for Reno alone.