Awesome collateral from DL policy change...
..now DL has confirmed that if you use miles to UG on a revenue ticket, e.g. a Y, B, M int'l fare, and then you change the revenue ticket within the 72 hr window prior to departure...YOU WILL LOSE YOUR MILES!
Even on a Y class ticket.
Just in case there's anyone who hasn't grasped what this is, quite, yet... in DL's own published words, it is:
:-: best in class :-: