Whole schools are accredited. Specific departments may have their own accreditation on top of that, the importance of which depends on the industry. Business...very important. Aviation, nobody cares. Just make sure you go to a nice big State School. Remember, most Airline pilots don't even have an Aviation degree. "Aviation Accreditation" is just some B.S. schools like ERAU made up to charge $40,000/year and sway you from the cheap schools.