To revisit this topic, i am trying to figure out a way to book a cheap domestic fare and then pay for an upgrade using my amex plat (and get the upgrade fee back as a statement credit).
Do different airlines have different polices regarding this? Does it depend on status? Can it be done 2 weeks in advance?
Im looking to do this on either AA, UA, or DL. The only status i have is my BMI silver.