A bus driver must have what kind of CDL endorsement?

A bus driver must have a CDL if he/she drives a vehicle designed to seat 16 or more persons, including the driver. A bus driver must have a Passenger Endorsement on his/her CDL. To obtain the endorsement, you must pass a knowledge test on Sections 2 and 4 of this manual. (If the bus has air brakes, you also must pass a knowledge test on Section 5.) You also must pass the skills tests required for the class of vehicle you drive.