History of Aircraft Landing Aids – U.S. Centennial of Flight Commission "Happy Landings In Fog", June 1933, Popular Mechanics article on the early system setup in the USA. ILS Basics ILS Tutorial Animations Website dedicated to the description of ILS ILS Tutorial Animation Archived 2016-03-04 at the Wayback Machine - Illustrates and describes how ILS navigation signals are displayed on board of an aircraft in various positions, which may occur during a safe approach for landing. Categories of the ILS Jackson, Hagan L.