Originally Posted by
AsiaTravel2019
Flying in Business (I fare) on a JL ticket from JFK to SFO in business. Am interested in using cash or miles to upgrade to Flagship First. Can AA do this when I check in? The flight shows in the AA app, but doesn't seem to offer the option to upgrade.
You might get a cash offer at check-in, but because your ticket is issued through JL I don't think you can upgrade with miles/copay or have any of the app/online offers beforehand.