i cross post this from the US forum, since the issue is regarding fare rules as well
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my corporate agent issued me this ticket for BOS-LAX-PHL-BOS (our policy for this trip is full fare + upgrade since it is not client travel).
the ticket comes in 2 portions (included taxes) $2470 on AA BOS-LAX-ORD(x)-PHL; $472 on US PHL-BOS. I would upgrade AA portion with purchased e-upgrade cert and US is comp upgrade since it is full fare Y. so the total cost is $2942 + 320 (AA upg cert for PLt mmember: 10 certs, bos-lax, lax-phl) = $3262 which i think is extremely expensive for a Y tkt.
here are the questions:
couldn't i just do this with ONE IATA full Y ticket? could this just eliminate the $470? (or my tkt is not full Y?)
what the agent told me is you can only upgrade US if it is full Y (issued with US?). I am a US GOLD DivM member, i thought they said preferred member could upgrade with some restricted Y tkt. wouldn't a $2400 tkt already be some sort of Y?

how much does a FULL IATA Y ticket cost for BOS-LAX RT? i search most site they never quote higher than $2500.

the company pays for the ticket anyway. but i am interested in the mechanism and also don't think that kind of pricing is usual.

appreciate your comments.
(i recently relocated back to US and am not too familiar with the rules here)
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