Derco Aerospace Inc. , a Milwaukee-based provider of aircraft parts, repair and logistics services, has partnered with three other companies that support F-16 fighter jet fleets to streamline parts and service delivery in a rare collaboration, Derco officials said. The teaming agreement formalizes the joint supply and systems services of Derco, Eaton Corp. , Honeywell International Inc. and UTC Aerospace Systems , which has an electrical systems operation in Pleasant Prairie.