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Some AA flights SFO-JFK are operated as 3-class. They are known as Flagship flights, generally operated by 777 or 767-200 aircraft. If its a 757 or 767-300, then stick with CX via YVR.
Note that if it is an AA class class service, biusiness class D fares such as DONEx or DCIRxx fly in business class. If its a 2-class service, then the same fare flies in F.
The 2-class AA domestic F is ok on 767-300 or 777, but not good for a long flight on 757 (or MD80, but they can't stay in the air long enough for trans-continental).
Another point to note is the SC and QF FF points earning of the different flights. AA flights earn a status bonus for QF FF members (100% for Plat, 50% for Gold and 25% for Silver, just like QF and BA flight numbers). But CX flights don't earn that status bonus. Also note that AA domestic F earns F class status credits, even if the fare paid is D class.
Does "west coast" = AU or USA? If USA, CX don't fly that sector and you're possibly looking at a CX/AA code share. (Exception YVR-JFK)
If you mean West Coast AU, then CX 1 stop PER-NYC via HKG is the best routing and service by far... Great service, great transit in (arguably) the best lounges in the word (they have two at HKG) and then a non-stop service to JFK with Audio/Video on demand (QF/AA don't have it!) with 5* meals and wines...