There is a certian B fare basis that gets auto UG's. There was a thread about it, I beleive it started with B3B or BBB would get the auto UG.
I myself, in the past 2 months have been EAU'd the night of the ticket purchase. (I purchase through a travel agency so they aren't UG'd at time of purchase, even with Y, they get UG'd at night)
Originally Posted by mnredfox
As far as I know, B fares do not get an auto UG into FC. Only full Y-fares do. Though everytime I've gotten a B fare I either get EUA'd or BF UG'd.