Originally Posted by imgonnafly

I read the guide and saw this: ANY FLIGHT INTERRUPTION INCLUDING THOSE CAUSED BY WEATHER
OR ATC THAT RESULTS IN GS/1K/PASSPLUS/UF/UB OR STAR GOLD
(INCLUDING DOMESTIC PORTIONS OF AN INTL ITINERARY) CUSTOMERS
BEING UNABLE TO REACH THEIR SCHEDULED DESTINATION BY THE
LAST DEPARTURE OF THE DAY.

question: what is UF/UB?