I've been a very loyal UA flyer over the past decade, but prices and availability see me booking a ticket on Continental.com. I'm now a [lowly] Premier on this routing: SEA-IAH-PHL-SFO-SEA 1. PHL-SFO-SEA is obviously UA Metal (CO#) can I used a UA Regional Upgrade on that? 2. Should I be scared of coach on CO? 3. Why didn't I get PremEx in 2010? 4. Why am I asking so many questions?