Hi, I'm trying to use my AA miles to get an award on alaska.

If I use an availability tool (such as expertflyer) to check fare-class availability, for which letter should I look:
for coach award travel on planes with more than one cabin?
for travel on horizon flights (one cabin only)?
for travel award travel on planes in first class? (I think the answer to this one is "A," based on a search of this forum)

thanks,
shawn