Thanks jubilada, just to clarify, the only thing I have to do is purchase now and then print out passes sometime around the 24hr before flight period, or 10hr before,etc or even at the airport?

Yes, aisle seats are important but what's more important is finding room in the overhead bins.

cd, yes. You can print out anytime within the 36 hour window until the time of your flight. I do it ahead because why not?

Bin space is sometimes an issue , but again, not if you are in the AOr B boarding groups. I always check my bags as you get 2 for free.

Thanks sr_ and jubilada. I would like to do carry on if I can get everything into 22in and if DH can get everything into 22in. :-)
I did go ahead and purchase.