With the onset of the Second World War, the United States government created a Defense Zone extending inland from the coastline, where private aircraft were restricted from operating. Burlington Municipal Airport was located approximately outside of the Defense Zone, allowing it to conduct pilot training both locally and from other airports located within the restricted zone, one such example being Boston's Logan Airport. Due to increased demand, the Burlington Municipal Airport was noted as being the busiest airport in the world on both August 14, 1942 and February 11, 1943, with 662 and 793 landings respectively.