What does Grant Assurance #20 require airports to do?

Grant Assurance #20 requires airports to protect the airspace around the airport. This assurance is part of the terms set by the FAA for airports that receive federal funding, ensuring that they take necessary steps to safeguard the airspace for safe flight operations. Protecting the airspace is crucial to maintaining the safety and efficiency of operations within and surrounding the airport, as it helps to prevent conflicts, encroachments, and potential hazards to aircraft during approach, departure, and transit phases.

The other options do not align with the specific requirements outlined in Grant Assurance #20. For example, providing maintenance for old aircraft and increasing the speed of aircraft on approach deal with operational aspects of air traffic rather than airspace protection. Similarly, opening more non-aeronautical lands does not address the fundamental intent of ensuring a safe operational airspace, which is the primary focus of Assurance #20.