In what may be a harbinger of things to come, Will Smith and Kevin Hart have signed on to star in Paramount's remake of John Hughes' 1987 comedy Planes, Trains & Automobiles. Steve Martin and John Candy starred in the original road trip movie as a mismatched odd couple who share a three-day odyssey of misadventures as they try to make their way home to Chicago in time for Thanksgiving. Deadline reports that Aeysha Carr (Brooklyn Nine-Nine) will write the script, and though the trade doesn't elaborate regarding who will play which role, I imagine that …