Agents confused me about the fee of $150 when chainging flights
 

Outbound on Alaska to HNL then QF to SYD

Return is the issue:
QF to LAX arrive at 6:30am
then AS (Alaska) to SJC via Portland arriving at SJC by 6:30pm - this is for Feb 2016

They have direct AA flights to SJC but none is available currently - I get told there is no fee to change it to AA (LAX -> SJC) since AS is still in my itn on my way out; I was also told there is a fee because I am changing the carrier - which is correct?

Update:
Award ticket

This is an award, right? And you're changing a flight from a non-oneworld partner to AA / a oneworld carrier? There may well be a redeposit fee to issue a new award.

Yes Award ticket

I was told AS is non-oneworld

AS is not OW.

See the discussion in this thread: http://www.flyertalk.com/forum/ameri...d-booking.html

Short version is redeposit fee applies due to changing from non-OW to OW.