Fare Classes Eligible for mySQupgrade
Just found a great fare LAX-NRT for September, but I'm wondering if there's a way to determine whether or not it will be eligible for a bidding upgrade. It's in the N fare class (economy saver). Conversely, for a little bit more I could book into the W fare class (flexi economy saver). Does anyone know which fare classes receive invites to bid on upgrades? Thank you!