My parents rarely use the travel benefit. If they don't get on a flight, they act as if their world imploded. They are typical of people who don't travel by air regularly, as soon as they get to the airport, they lose their minds, can't read signs, are overwhelmed by the crowds, etc.

Long and short, if you are going to list your parents for a flight, make it one they will likely get on and have a good experience with. The unending whining if they don't is just not worth hearing if they have a semi-bad experience.