THere's some busy airspace in, under, and around the PHX Class B Airspace. Those not familiar with these areas should consult the charts/freqs on the link below.
http://aftw.org/practice_areas.html
Unfortunately in science what you believe is irrelevant.
"I'm an old-fashioned Southern Gentleman. Which means I can be a cast-iron son-of-a-***** when I want to be."- Robert A. Heinlein.