https://ift.tt/2wwdHAe A Human Heart, Left Aboard, Sends Airplane Back to Where it Started Airlines and Airplanes, Transplants Passengers were delayed for hours as pilots returned to Seattle, setting off speculation about how long the heart would be viable and where it was headed. KIRK JOHNSON https://ift.tt/2BkuIMO December 13, 2018 at 05:30AM