What happened to Northwest Flight 2501?

On June 24th, 1950, Northwest Airlines Flight 2501 left New York City for Seattle. The state of the art DC-4 aircraft was to stop in Minneapolis for refueling, before proceeding to the west coast. Monitoring the plane in threatening weather over Lake Michigan, air controllers lost track of the flight. The aircraft was never recovered, nor were any passengers or crew. Further wreckage discovered some days later indicated a total loss.Peter Whorf speaks with Valerie Van Heest about today’s 64th anniversary of the tragedy and the parallels with a more recent aviation mystery. She is a Holland-based diver, shipwreck historian, and author of the recent book, Fatal Crossing: The Mysterious Disappearance of NWA Flight 2501 and the Quest for Answers.