Originally Posted by
Ambraciot
Perhaps the concern is about a cyberstalker or ex willing to try multiple combinations to see who you currently choose to vacation with.
If this was the case and the cyberstalker or ex is smart enough to know the trip date and destination, they probably have access through the same means they used to find out previous info (friends, family, etc) to find out everything without going to the trouble on aa.com.
I see no privacy issues whatsoever.