Question:
What is a private motor carrier of passengers (business) and what is a private motor carrier of passengers (non-business)?

Answer:

 

Private motor carrier of passengers (business) means a private motor carrier engaged in the interstate transportation of passengers which is provided in the furtherance of a commercial enterprise and is not available to the public at large. 

For example, this would include a company transporting its own employees between job sites, but not selling seats to anyone else.  

Private motor carrier of passengers (non-business) means private motor carrier involved in the interstate transportation of passengers that does not otherwise meet the definition of a private motor carrier of passengers (business). (49 CFR 390.5)

For example, this would include a place of worship transporting people to services or other events, not for a profit.