what is operating under part 91
One of the first things you hear about when you begin using business aviation in the U.S. is the mysterious but important distinction between Part 91 and Part 135 operations. Many people still think about the difference in simplistic terms: Part 91âgood; Part 135âbad.The facts are considerably more complicated. Part 91 is the section of the Federal Aviation Regulations that provides general operating and flight rules for civil aircraft (see chart).Whether you're flying a Cessna 182 or a Boeing 777, you have to comply with these rules.ne of the first things you hear about when you begin using business aviation in the U.S. is the mysterious but important distinction between Part 91 and Part 135 operations. Many people still think about the difference in simplistic terms: Part 91âgood; Part 135âbad. The facts are considerably more complicated.