Originally Posted by
Shareholder
Is there a reference somewhere comparing fare classes (primarily economy classes) which track equivalent fare codes? For example, I am booked on a UA codeshare flight operated by AC. The UA fare code is T, but what does that track to on AC? I don't believe it is also T.
AFAIK that is city-pair dependent. There might be a correspondence that works
much of the time, but not reliably enough to call it a "rule".
I find a comparison of the base fares is usually pretty reliable. For example, find the AC fare with the same base fare as the UA T fare on that route.
You could do this by trial and error on ITA (specify a specific fare class and uncheck the "check seat availability" box) or using a KVS/ExpertFlyer sort of service.