New to MVP Gold (status match in Dec 2016 - Thank you AS! ^^) - my question is whether it is better to book an American Airline flight or the same flight under Alaska Codeshare for SJC-PHX-SJC? Corporate travel shows this route as operated by AA but same flight appears to also be bookable as an AS codeshare (Operated by AA)

Important to me in order from most to least are the following:

* free same day changes to earlier or later flights
* free standby for earlier full flights
* ticket cost (actually this is most important to corporate finance!)
* Alaska miles YTD "elite tier status qualification" credit over credit as "Partner qualifying miles".
* non-stop over connecting flights
* complimentary upgrades if available

TIA!