Originally Posted by
jdrtravel
Note that if you upgrade the ticket this could end up putting you into a nonrefundable fare class, depending on what fare you upgrade into. It's possible that the cheapest upgraded (nonrefundable) fares are cheaper than your refundable coach ticket.
Fare classes have nothing to do with if the ticket is refundable, changeable, or if a fee applies to do either. The fare rules do.
If you upgrade a refundable fare to a non-refundable one, the whole new amount becomes non-refundable. If you upgrade a non-refundable fare to a refundable one, the original non-refundable amount remains non-refundable.