Just a warning on non rev travel for your parents. They get 18 flying days a year if I recall. If they exceed that Delta will charge you 150 per flight and send you a bad letter. Also make sure they check in as S3B's not S3. Listing as a S3 will get you another 150 dollar fine and bad letter. I wrote S3B in big letters with a indelible marker on my mom's pass card since you can never remember her priority.