I've searched online and throughout this thread but can't seem to find a definitive answer. The two VS agents I just spoke with didn't seem to know since they said they usually deal with customers who first book J and want to upgrade to F at a later date.
If I've already booked a flight in F, downgrade to J (to better align departure dates with my girlfriend) and subsequently find availability back in F, will they allow me to move classes again? Flight isn't until April 2020. I'm fine with paying the $50 change fees each time but was hoping someone could clarify, thanks.