There are a few articles and a bunch of blog posts, often full of factual errors, which talk about an interesting phenomenon that happened in the late 1960s and early 1970s at major US Airports. It was an idea put forward as a way to add more takeoffs and landings without having to buy or fill land for new runways. The approach was referred to as STOL (Short Takeoff and Landing). While this concept is still used in places where longer runways are just impossible to build, the idea never took off (pardon the pun) and these runways disappeared after a short time. But, for a few years, some of the biggest commercial airports constructed comparatively tiny runways right next to their big ones. These small runways (4,000 feet or less than half the length of regular ones) allowed specially equipped small passenger planes (like the DASH-7 and Twin Otter) to take off and land and save the larger runways for bigger jets.
Over the last several decades, I have collected one of the largest libraries of airport directories I’m aware of, which is now digitized and OCR’ed. Here are some images from my collection showing the official documentation of tiny runways at the top-30 busiest US Airports.
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LaGuardia had the world’s first STOL runway 1/19 in 1968. But most people have forgotten that there were actually two! The ORIGINAL short runway at LaGuardia was only 1095ft long! It was supplemented a year later by a longer(!) STOL runway at 2000ft which stayed in operation for several years. (image source: 1972 Flight Handbook)
Boston Logan (BOS) may or may not count as a STOL runway since this tiny runway slightly predates the concept of STOL. I’ll have to dig a bit more to find out why runway 15l/33R was originally built. Here we see it depicted on an airport diagram from 1967. (source: Aerodrome Sketches) Logan’s STOL runway is still in existence today! In fact, I think this is now the shortest runway at any of the 30 busiest US Airports. Here’s a video of a small plane landing on Boston 33R in 2011.
Seattle Tacoma International (SEA) was the only major airfield on the west coast to sport a STOL runway numbered 17/35. Theirs was added in the early 1970s and stayed in operation until 1979. (Source: AOPA Airports USA 1978)
An honorable mention is reserved for a few passenger-serving airports in the 1970s which consisted ONLY of a short STOL runway:
I’ll also note that in the 1970s, many small airports were frequently named “STOLports” since it was a trendy name at the time. But other than the ones I link to above, the others did not have passenger service.