Which statement correctly identifies the two broad categories of U.S. airport facilities?

• A. Towered and non-towered
• B. Controlled and uncontrolled
• C. Public and private
• D. Domestic and international

Answer: (A)

The key distinction is whether the airport has a functioning control tower. A towered airport has ATC services from a control tower, with pilots receiving explicit instructions and clearance as they enter and move through the airspace around the field. A non-towered airport lacks that tower, so pilots coordinate with each other using a common traffic advisory frequency, announce their positions and intentions, and follow standard patterns without ATC clearances. This difference directly describes how the facility operates and how traffic is managed.

Public vs private describes ownership, which isn’t about the facility’s operational category. Domestic vs international refers to the scope of operations and border processes, not the presence of a control facility. Controlled vs uncontrolled is closely related, but the most straightforward way people categorize the facilities themselves is towered versus non-towered.