I am curious about booking a flight in economy (PHX-IAH) and how it will work for getting a free upgrade to first. I am more familiar with Delta and being platinum I usually find out 5 days before the flight. Well, with Continental, I rarely fly with them in the USA, mostly earn the miles on other *A carriers.

So, if I book an economy ticket on CO as a Platinum member do they offer free upgrades similar to Delta, given availability.

Thanks and sorry for kind of a newbie question... Powers