As I tranfer from paper logbooks (little redbooks), it is nice that Logbook Pro (PC version) remembers tail numbers. However, after a while, tail numbers drop off from the "Ident" pulldown menu. I keep having to re-enter some of the less frequently used tail numbers. What are the parameters that Logbook Pro uses to retain the tail numbers? Length of time? Max. tail numbers? How do you modify it so it remembers ALL of the tail numbers I enter?