Radiocycle, what route did you fly, and what type of aircraft were you in??
HP has a number of nice, new Air Busses, as well as some older 737s and 757s. My hunch, based on little info and supported by laziness of not wanting to check
is that the 737s are mostly used on the gravy runs: PHX/LAS to Southern CA and places like ABQ/SLC/ELP (say, flights of under an hour), while the 757s and newer Airbusses are being used on the longer routes.