The previous thread had gotten off track a bit.  Let’s Re-center the conversation in this forum.  NTSB prelim out: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20190724X81016   On July 21, 2019, about 1000 central daylight time, a Mooney M20J airplane, N9201A, and a Mooney M20U, N197CV, collided in flight while flying in formation for a mass arrival at Wittman Regional Airport (KOSH), Oshkosh, Wisconsin. Both airplanes sustained minor damage. Neither pilo