Originally Posted by
oopsz
Used to be if you bought a Full Y fare, you could standby for a domestic upgrade- but you were last in line for upgrade priority, behind all the silvers. Generally wasn't worth it.
Originally Posted by
sbm12
This is still the case AFAIK. They don't market it since they so rarely deliver on it but the benefit is still there.
Z and D fares are typically less than full Y, and D fares are usually fully refundable, so it's also possible they don't market it because there's no reason to purchase a domestic Y fare.