<P> A 1,000 - acre (4.0 km) special economic zone for the aerospace industry is being set up near the Bangalore International Airport . Bangalore was also home to large domestic airlines - now defunct Simplifly Deccan and Kingfisher Airlines . </P> <P> Other heavy industries in Bangalore include Bharat Electronics Limited, Bharat Heavy Electricals Limited (BHEL), Indian Telephone Industries (ITI), Bharat Earth Movers Limited (BEML), HMT (formerly Hindustan Machine Tools), Hindustan Motors (HM) and ABB Group . </P> <P> Bangalore is also becoming a destination for the automotive industry . Volvo has a manufacturing plant in Bangalore . </P> <P> Bangalore houses many small and medium scale industries in its Peenya industrial area that claimed to be one of the biggest in Asia 30 - years ago; newly including Apple's India manufacturing plant - the only active plant outside of China . </P>

Describe the various factors which have helped in the development of it industry in bangalore