"Black outs" is a term used to describe a temporary loss of consciousness or memory caused by a disruption in the brain's functioning. It means that a person cannot remember what happened during that time. Full definition
The best part about this is that you don't have to worry about dealing with black out dates and transferring points to airlines and hotels. (uponarriving.com)
My other big complaint with the room is lack of black out curtains. (singleflyer.com)
This means you don't have to worry about black out dates or transferring your points to certain programs which can get quite confusing or frustrating at times. (uponarriving.com)