Originally Posted by
djibouti
When searching for availability in a particular award class (T on AA, for example) some flights don't even appear, whereas others appear with an inventory of 0. Adding more classes, I get stuff like this for one flight:
F7 Z1 Y7 T0
And this for others:
F7 Z2 Y7
What's the difference between T0 and T not appear at all?
Assuming you are using the Award and Upgrade tool and not the the Flight Availability tool, when a route for a given date has no availability for a given class later than two flights that are zero then the GDS will no longer return any availability for that route for the requested class.
For instance, take a route with many flights on a given day, say DFW-LGA on AA. Maybe the first two flights have T availability and that inventory will be shown. If all remaining flights for that day have no T inventory then the GDS will show the next two flights as T0 and show nothing for T for the remaining flights that day.