Most jobs in the aviation industry require some type of professional licensing. The training can be completed at any aviation college/university or at a technical school that offers training and licensing for your specific field. We have just about every aviation university in the USA listed on our site.
If you are thinking about dipping your toes into the aviation industry, make sure that you have a 4 year degree. Most (but not all) aviation related employers require you to have a bachelor's degree that doesn't necessarily have to be in an aviation related field (but it does help). Employers want to make sure that you are properly educated and have the skills and brains that they are looking for before they hire you. So start searching for the aviation university that best suits your needs.