Imagine taking your next trip of a couple hundred miles. New York City to Boston, for example. Or Houston to Dallas. Tampa to Miami. The obvious choice now might be to drive. But what if you could show up at an airport at one of those cities, bypass security checkpoints, board a small hybrid-electric plane with luggage in hand, and be on the ground at your destination in about an hour — all for $25 each way? A company called Zunum Aero hopes to make that a reality, so that future travelers who normally take a car, bus or train for regional trips won’t think twice about flying.