Hello from Sunny Southern Alberta, Red Flyer!
Man, do I ever miss Phoenix and Sky Harbour. My Mom is American, and my Grandparents (now deceased) retired to Phoenix in 1969. I spent far too much time on vacation in the 100+ F weather plane spotting along 24th Street.... Can you still spot there unencumbered by security?
Up here in YQL (Lethbridge, Alberta, CANADA)... we get the same phenomena on a regular basis. Lethbridge is 60 miles from the CDN/US border, and is aligned E-W with most of Canada's major cities. YYC
(Calgary, Alberta) only 45 minutes by air north of YQL,and there is substancial traffic north-south. YVR
(Vancouver, British Columbia) is about 1.5 hours flying time from YQL, and there is significant traffic E-W at all times of day & night. With the great circle routes from the US west coast to Europe, there is also major traffic flying overhead constantly also.
On a good day WITHOUT any wind (our area of Southern Alberta is among the top 5 windiest areas WORLDWIDE)...we certainly can get the criss-cross pattern identical to what you experienced....
My only complaint? YQL will never see 1/10th the traffic of PHX
...regradless of fly-overs or not!! (Although we are the main diversion airport for YYC
in inclimate weather).
..As an FYI... here is a map, showing YQL's location relative to PHX
. I am almost directly north of you....by 1400+ miles...