Decades ago, I made several flights from San Antonio to Austin. I think that was about 80 miles, and I guess they just left the flaps down. I wondered why the airline had that flight, but it was a hoot in 1988 during the triple mileage campaign, as I'd get 3,000 extra FF miles, back when they were valuable and easy to use, on the same priced ticket to Lubbock.
SWA? Back then it was credits, 1 credit each way regardless of flight length with 16 credits to earn a RapidRewards RT ticket anywhere they fly. You had people gaming the system, taking cheap short hops (even ultra-cheap weekend fares), often making the RT in one day, then using the reward for an expensive cross country trip.