Although the partner pages on United Hub don't specifically indicate the 500 mile minimums, I've had colleagues who traveled on 3/3, 3/4 and 3/5 on both US and AC and when the miles posted they both received 500 miles on the short hops. So, before I book any short hop US or AC segments, I want to be certain that the 500 mile minimum is still intact and that what happened with my coworkers just isn't another thing they need to fix in this transition mess.