Thank you both for your answers. I am used to LAX, SFO, and SJC where operations are normally toward the west. So I thought these other airports also had "normal" directions.
DEN was real puzzling with all those criss-crossing runways, although I had guessed north or south was the primary since three runways go that way.
So PHX reverses every afternoon, huh? Interesting.
Does anyone know about the main direction for SLC?