Butler Aerospace & Defense | 27,721 followers on LinkedIn. Accelerating the pace of innovation and agility for Aerospace and Defense Industries. | STATE-OF-THE-ART, QUALITY, COST-OPTIMIZED SOLUTIONS Founded in 1947, Butler Aerospace & Defense/BAA is a U.S. Aerospace & Defense Engineering Solutions Provider, part of HCLTech, one of the global leaders of Engineering and Technology solutions. Companies and Agencies come to us when they need to solve engineering challenges and enable their digital transformation.