Aircraft Repair, Service & Maintenance. Pro Av Flight Services has two FBO's located along the front range of the Colorado Rocky Mountains. Founded in 1998 in Penrose (1V6), Pro Av has provided Southern Colorado aviators a quality alternative for all their flight related needs. The Fremont County Airport location provides aircraft maintenance, flight training and pilot supplies.. We also offer T-Hangars for rent by month and can hangar larger aircraft for one night or longer in our larger hangar. Our second location opened June of 2010. Located on the general aviation side of the Colorado Springs Municipal Airport (COS) provides aircraft maintenance.