As a small business person I evaluate the value of a sales call against the cost and time of travel. The 1 hour flight time is often a problem to decide between driving and flying. This Lifehacker posts reminds us there is more costs involved than just the gas.
An important travel factor is time. If you have a 1 hour flight you have to factor in the door-to-door time. On the front end of a flight you often have 2-3 hours of getting to and through airport security then boarding and takeoff time. The end of the flight has duplicate time so a flight can often have an extra 3-4 hours above and beyond the air time.