Originally Posted by
aktchi
How am I supposed to interpret a response when a particular bucket is missing altogether?
Example: Yesterday, I searched for Z, U, and C availability on an AA flight and it showed Z6 U2 C4. Today Z6 C4. A few other flights explicitly say U0 but in this case U is simply missing.
Should this be treated as "U0" or as "some bug, check later"?
U0. For the case where you see 2 U0 flights before your flight, as noted in the help for the Awards and Upgrade results page:
•Sometimes American will return just two flights where the requested award seat availability is zero on both flights, even when there are later non-stop/direct flights scheduled. This is American's way of indicating that none of the later flights have available inventory for the request class either.
To test, set the time of day to just before the departure time of the flight and it should show as U0. It is also possible that AA removed the class from the flight temporarily. Rare, but we've seen it happen.