The thing is there just aren't many places that fit this.
Requirements:
Proximity to population center: 30 Miles
Proximity to International airport: Within approx. 45 Minutes
Proximity to major highways and arterial roads: Not more than 1-2 Miles
Close to major arterial roads to provide optimal access
Access to mass transit: At site
Direct access to rail, train, subway/metro, bus routes
50K jobs, million+metro area. There are some specific requirements about daily flight locations, too. I don't particularly care about where Bezos goes, but what are the options? Um..Denver? Minneapolis? LA? Philly? Baltimore? Houston? Dallas? DC? NYC and SF I guess but that would be sorta nuts. Where am I missing?