The route map uses tan dots for some stations. I thought it might mean hubs, but then that would mean YVR, HNL, SEA and PDX were hubs in addition to LAX, SFO, DEN, and ORD. So what did the tan dots mean?

The other thing that struck me was how much more extensive the overall route network is today, even with cut backs, even with more competition. While a far cry from the days when UA was the only airline to service all 50 states with main line service, things could be much worse.