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The easiest, fastest, and least expensive means of passing the FAA Airline Transport Pilot (Part 121 or 135) knowledge tests.
Gleim's Knowledge Test Books are indeed the most used of all books when passing the FAA knowledge tests.
This will provide you with the easiest, fastest, and least-expensive means to prepare for and pass the FAA knowledge test.
Gleim's books are the most efficient in preparing you for the FAA written knowledge tests.
Gleim's Knowledge Test Books prepare you for the FAA Sport Pilot written test.