Take the written passenger test, road test in a bus. The only passenger vehicles I've ever seen requiring a Class A CDL were the 'cattle cars' when I was in Basic Training, and those might have fallen under an exemption from requiring a CDL... you'll be restricted to whatever class of license is required for the passenger vehicle you'll road test in, so, if you take it in a bus requiring a Class B, you'll be restricted to passenger vehicles requiring a Class B or C CDL.
Only if you have the appropriate passenger endorsement.
Restrictions include: B - corrective lenses required D - Anatomical Donor M- Restricted to Class B and Class C Passenger vehicles (This restriction goes with a P - passenger endorsement on a class A CDL) N- Restricted to class C Passenger vehicles (This restriction goes with a P - passenger endorsement on a class A CDL)
All you have to do to get the endorsement is pass the written test and road test in a passenger vehicle. However, if you have a Class A CDL and road test in a vehicle requiring only a Class C CDL, you'll be restricted to operating passenger vehicles in that class and lower.
Depends on the GVW of the vehicle. If it's under 26,000 lbs. GVW, it requires a Class C CDL with passenger endorsement. If it's over 26,000 lbs. GVW, it requires a Class B with passenger endorsement.
You may only have one license. If you have a Class A CDL, you can operate a vehicle requiring a Class B or Class C CDL, so long as you have any endorsements necessary for the vehicle type (e.g., tank endorsement for tank vehicles, passenger endorsement for passenger vehicles, hazmat endorsement for vehicles hauling hazardous materials, etc.).
You can't get an air brake endorsement ANYWHERE in the US on ANY class of license, because it doesn't exist.
Yes, but you'll receive a restriction appropriate to the class of vehicle you road test in for your passenger endorsement (e.g., if you road test in an 18k GVW passenger bus, you'll be restricted to buses requiring a Class C CDL, if you road test in a 26,001 - 33,000k bus, you'll be restricted to buses requiring a Class B or C CDL).
Yes - both a written and road test are necessary for the P (passenger) endorsement, regardless of what class of licence you currently possess.
Yes. The vehicle would require a Class C CDL with the Passenger endorsement.
At a minimum, a Class C Commercial Drivers Licence with Passenger endorsement and no air brake restriction (if the vehicle is equipped with air brakes). If the vehicle has a GVWR of over 26,000 lbs (which is a bit unlikely with an 18 passenger vehicle), then a Class B CDL would be required, again with the Passenger endorsement and without a restriction on air brakes, if the vehicle were so equipped.
you would need a m-class endorsement to ride a motorcycle
As for endorsements exclusive to a CDL, you can get hazmat, passenger, and tanker endorsements. You can also get a motorcycle endorsement, which can be placed on any class of licence. The only endorsement you wouldn't be able to get is the endorsement for double and triple trailers.