Originally Posted by
CDKing
Round trip the most restricted fare rules apply to the whole ticket. The whole thing would become saver thus no reason to up charge to main. The same for all the US carriers with Basic type fares
True, but you may want to by up for reasons other than the ability to make changes (eg, elite seat selection, being on the upgrade list).
Also, the website won't show X if it's the same price as, or more expensive than, main. This leads to "forced" buy-ups on some multi-segment trips (on some short routes they have reduced X to be the same as main, presumably to compete with Southwest). So if you are using one of those segments as a connection, you have to buy up to main for the whole ticket. Probably a TA could book it, since AFAIK the fares that book into X still exist -- the website just won't show them.
Originally Posted by
channa
Just book as 2 x one ways. All AS fares are one way anyway.
But then you lose misconnect protection, and possibly the ability to check bags straight through? I'm not sure if AS will check bags thorough if there are multiple tickets.