Opened in 1997, Thunder Aviation at Spirit of St. Louis Airport (SUS) in Chesterfield, Mo., recently completed a 39,000-sq-ft storage hangar. The new hangar includes 9,000 sq ft of office space that can be tailored to the needs of tenants. With the new addition, the FBO now has more than 100,000 sq ft under roof. Thunder offers maintenance and avionics service to aircraft of all sizes, as well as hangar storage for based corporate customers. The FBO also provides aircraft management services.