Originally Posted by VFR

JetBlue’s IT is pretty bad, especially for codeshares.

You will be in Mint; the JetBlue website said my economy fare was in First (?) on a plane that was all economy.

You will have to contact JetBlue to get a seat assignment. You can call, though I had quite good luck DMing them on Twitter.

The chart you linked to is for B6-marketed fares; since your flight is marketed by AA, you need to look at the AA chart. R is a discount First/Business fare that earns 2 EQMs per mile flown.