Yes. Unless you happen to cross the international date line westbound, as I recently did. So if didn't get my $13 refund. No big deal.
The app lets you use one travel credit only. The web lets you stack them.
Thanks. Does the website allow >2 credits?
Recently the app only allowed 2, due to 3 max methods of payment. Or maybe it was indeed only 1 credit.
Edit: Turns out the website behaves the same as the app--two credits, third must be CC/PP or something that covers the balance. I think it might allow three credits if the combined value exceeds the cost of the ticket.