After I got hired by Delta, I emailed Airline Apps to cancel my subscription. The only other airline I had checked was United, although I wasn't really looking to work for them…it was free to check the box, so I did. The lady at airline apps emailed me back and said it would just run out at the end of a year, so just let it be and it would take care of itself. So to answer the question, I'm sure there are people in the pool who are already happy where they are, but haven't bothered to do anything with their application at other places. At least there's one, anyway…