Originally and through the 1960s, the Adirondack Airport had three runways, all of which were 4000 feet long. Between mid-1957 and mid-1958, the main runway (5/23) was extended to 5000 feet long. Runway 16/34 was long and wide, but was abandoned sometime between the mid-1970s and early 1980s. The main runway was then lengthened from to its present length during the early 1970s or thereabouts and an instrument landing system and approach lighting system was installed on the southwest-facing runway 23. Also, a parallel taxiway was added to almost the full length of runway 9-27 and a partial parallel taxiway was added between the abandoned northwest-southeast runway - part of which was converted into a taxiway and the approach end of runway 23. Around the mid-2010s, runway 27 had its landing threshold displaced by 400 feet.