ST. IGNACE, Mich. Authorities are seeking information about a plane that flew under the Mackinac Bridge in late June. This was extremely reckless behavior on the part of the pilot, and it imperiled the safety of everyone on the bridge that day, said Det. We hope that someone can come forward with information to help us make sure it doesnt happen again, Demers said. A Coast Guard crew recorded the June 28 incident on video. The bridge connects Michigans two peninsulas over the Straits of Mackinac.