PLATTEVILLE, Wis.--(BUSINESS WIRE)--AVISTA Incorporated®, a leader in critical-systems software engineering services, has partnered with Panair International, Inc., a company specializing in sales representation for manufacturers of electronic and electro-mechanical components and equipment to aerospace and medical device manufacturers in South America, to further expand its business reach. AVISTA brings 20 years of expertise in life- and safety-critical software development for avionics, medical electronics and government/military applications.