I frequently highlight awards bookable with American AAdvantge miles in premium cabins because they tend to make fewer seats available than many other airlines on their own planes and because they have fewer partners through the oneworld alliance than United does through Star.
As a result it’s worth jumping when there are plenty of award seats available on long haul routes. That’s doubly true when you’re looking for more than two seats, because finding availability for four is exponentially harder much of the time and to many destinations.