Welcome to FT!
You do not actually have any A3 Fares -- you have 2 UA Fares (SEA-ATH + ATH-SEA) combined on a Half R/T basis, with a Stopover in CHQ.
Wow, very interesting--thanks KVS! If I were given the list of fares as:
SEA-FRA, YR1
FRA-SKG, YR1
SKG-CHQ, YR1
CHQ-ATH, YR1
ATH-FRA, SHX21NCE
FRA-SEA, SHX21NCE
How am I supposed to tell that I had the SEA-ATH fare with a stopover? Can I safely assume that you can "collapse" all the fares with the same code?
Thanks!