Which class of airspace is often associated with airports that do not have control towers?

Class G airspace is typically associated with airports that do not have control towers. This category represents uncontrolled airspace, where pilots operate with the least restrictions compared to controlled airspace categories, such as Class C, D, and E. In Class G airspace, air traffic control services are not provided, which allows pilots to operate freely without the need for clearance from air traffic controllers. It is primarily located at lower altitudes beneath the overlying controlled airspaces, such as Class E airspace that begins at a designated height above the surface. This structure facilitates flights in rural and less-trafficked areas, encouraging general aviation and private flights, especially around smaller airports.