I took a UAX (Express Jet) flight back on July 1st. Hasn't credited, even though the other flights on UA that day credited in about 48hrs. I called in today, and eventually was told that UAX is treated as a partner airline and to wait 15 days for the miles to credit. Annoying.

I was on an Express Jet flight four days earlier that credited right away (at the same time as UA flights).