In terms of hubs, I really like DFW. As long as the weather is clear it's a smooth operation, and the new gates (D1-4 and high Cs) are really nice. Plus the plethora of Admirals Clubs plus Centurion and Capital One lounges, and the people mover. For outstations I'd have to say SFO. I never realized how loud an airport was until I was there with their quiet policy of not having announcements and blasting TVs everywhere.