John Robinson Aviation Services Limited (jras) is a Asia Pacific based business providing management consultancy services to specialist aviation industry companies and owners and operators of certain types of commercial aircraft and jet engines.jras areas of expertise include the sourcing, acquisition, financing and leasing of aircraft engines, nacelles and associated aircraft products and services as well as long term business relationship management. These services, provided together with sales, marketing and business development services, provides jras clients and customers with a comprehensive solution to meet both sourcing and representation, sales and marketing needs throughout the region.