"As an added benefit, when a First Class or Business Class seat is available, the upgrade is automatically processed nightly according to Elite level, type of ticket purchased (both full and discount Economy fares), fare class, date and time of reservation." From CO's Web Site.

What are the fare classes (my tickets show T, Q, and S) and how do these relate to each other when determining upgrade chances? I'm attempting to develop some techniques to better the chances for an upgrade. I usually travel between San Juan through Newark to Los Angeles and back. Thanks.

Ken