Sim Shain: CEO of ParaFlight Aviation  and Urgentflights.com In the quiet, pre-dawn hours at Teterboro Airport, while the rest of the tri-state area is buried under heavy duvets, Sim Shain is often staring at a glowing screen, calculating the weight of a human heart. Not the metaphorical kind—the literal, beating muscle that needs to be five hundred miles away in less than three hours. Shain is the CEO of ParaFlight Aviation  and Urgentflights.com , but to describe him as a