Well, I think I learned the hard way. One call to US Dividend Miles and I was told that ONLY the Preferred MEMBER was entitled to waive blackout dates, and not his/her family. A second call I learned that family is included if traveling together with Preferred member.

On repeated attempts with UA and their partner, Mexicana, I could not find award travel.

DL was tough, but somewhat available. US had almost everything available for award travel.