Airline Transport Pilot Test Prep 2012: Study and Prepare for the Aircraft Dispatcher and ATP Part 121, 135, Airplane and Helicopter FAA Knowledge Exams (Test Prep series): ASA Test Prep Board: 9781560278542: Amazon.com: Books
Regularly Scheduled Air Carriers (Part 121) | Federal Aviation Administration
Part 125 | NBAA - National Business Aviation Association
Part 121 vs. 135, 125 and 91 of FAA regulations - AVISAV