Yes, a motorcycle endorsement is added to an existing driver's license, making it a motorcycle license. The terms are interchangeable, except at the DMV.
No.
No such thing as an air brake endorsement on a US license.
No dummy. The 'M' endorsement goes on your drivers license.
It depends on the laws in your state. Some states don't have separate motorcycle licenses - motorcycle is an endorsement, so yes, you would need a drivers license with a motorcycle endorsement. However, other states offer a Class M license which is just for driving motorcycles. If you later want a vehicle driver's license, then you get a new license and the Class M endorsement is added to the new license.
An "H" endorsement on a Commercial Drivers License "CDL" means that a driver is qualified to transport hazerdous materials.
The X endorsement is a combination of two endorsements - Hazmat (H) and tanker (K).
You can't get an air brake endorsement ANYWHERE in the US on ANY class of license, because it doesn't exist.
you would need a m-class endorsement to ride a motorcycle
If you have a drivers license, it must have a endorsement to operate a motorcycle.
A Can-Am falls under the category of motorcycles and a endorsement/license is required.
There is no such thing as an air brake endorsement on any license in any US state or territory.