The cost caries based on the direction of travel, originating city and day of week. See the chart below for details:

Elite and all Y-fares may confirm the upgrade 24 hours prior to departure on the first segment of the itinerary that includes the flight to/from HNL through Continental Reservations (or at the airport if you so choose). All other customers on published fares may confirm only within two hours of departure and only at the airport. This includes non-elite customers travelling with elite customers (see here). Travel agents are not able to process these requests.

Only valid on flights operated by CO.

Subject to availability (Z class must be available).

Waitlisting is not permitted.

Not valid with free coach awards, unpublished fares, industry discount rates, unticketed reservations and ER1149/ER1181 tickets (free tickets donated by Continental to charities, sponsorships, travel agencies, etc.).

As noted above, connecting passengers may request the upgrade at T-24 from the first flight on the itinerary for elites and full Y fares. Furthermore, "through passengers," which is the term used in the GG REVUP details for connecting passengers, should be able to confirm upgrades on all segments of the itinerary, subject to the Z inventory availability.

Passengers who upgrade using the REVUP program are NOT shown on the PDA Info Site as upgraded passengers. In this regard the ticket is considered having come from Z inventory, which is not an upgrade bucket so it does not show as such. That being said, one should still expect to only earn the miles/points from the original fare class booked.

If you ever encounter an agent that is unfamiliar with this program, simply have them refer to GG REVUP for more details. If the agent does not want to process the request prior to the 2-hour window (and you are eligible for such as an elite or full Y fare) reference line 60 in the GG REVUP details.

See this post by CO Insider for the original information.