Västmanland Wing, also F 1 Hässlö, or simply F 1, is a former Swedish Air Force wing with the main base located at Hässlö Airport in Västerås in central Sweden.

Stockholm Västerås Airport, also known as Hässlö Flygplats, is a minor international airport located near the city of Västerås, Sweden, 110 km (70 mi) west of Stockholm Municipality and Stockholm County.