Originally Posted by
mahasamatman
And I've also used refare vouchers on a combined UA/UA code-share trip.
Though I suspect that's mostly due to GA leeway (or ignorance/apathy, if you're a cynic
) rather than something actually allowed. IIRC, refare vouchers (a.k.a. Travel Vouchers) also include the "UA/UX-only" verbiage.