The FAA ATP and the FAA Dispatcher (ADX) written exams are similar. For airlines operating under 14 CFR PART 135, dispatching duties and responsibilities are actually designated to "flight followers." The main difference between a flight dispatcher and a flight follower is that latter does not share legal responsibility for the operation of a flight. In addition, a flight follower is not required to obtain a dispatcher's certificate, although he or she is usually encouraged to do so by the airline for which they work and will probably not be employed as a flight follower if they do not have the dispatcher certificate.