Originally Posted by
jjmadison
RE: the theory that saver fares require Y space to be available, here is an example where only X is for sale.
When selecting "MVP® Gold guest" (thus filtering out saver) this flight option disappears.
Main is definitely available. Why the AS search engine hides it is beyond me.
Edit: AS doesn't hide it... no clue why it looks that way for you.
Cheap buy-up too.