I am not very good with Matrix, but I'm wondering if PHX-LAX-JFK-SYR is something that could be booked for premium TCON, instead of just PHX-JFK-SYR in the normal reclinder F seats? I'm okay with the A321 business since I'm flying with my wife so paired seats are fine.

I thought adding X:LAX to the ITA routing code would work but it doesn't come up and on AA.com I can't "book a connection as multi-city".