Newb here... I usually fly on Airtran which has there wonderful 40-80 dollar FC upgrade. I (because of price) booked a last minute trip to SFO (from DTW) on CO for this weekend. My flight home is a pretty bad red eye 12:30am PST to 11:30am EST I'm just wondering what kind of policy CO has for upgrading to first class at the airport (for the last leg of my trip) I've searched a bit across the forums and can't seem to get a clear answer on *purchasing* an upgrade as apposed to using miles or elite status. it would cost 800 dollars EXTRA to upgrade right now. Wondering if I should expect cheaper at the airport depending upon availability etc.. thanks ahead of time and sorry if I posted this in the wrong forum.