UA.V.B.K1: Types of airports such as towered, uncontrolled towered, heliport, and seaplane bases.

ACS Area V — Operations Task B: Airport Operations References: ACAdvisory CircularCloseFAA guidance that explains acceptable ways to comply with rules or understand FAA procedures. 107-2, 150/5200-32; AIMAeronautical Information ManualCloseFAA operational guidance and glossary material used to understand aviation procedures and terminology.; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-H-8083-25; FAAFederal Aviation AdministrationCloseThe U.S. aviation regulator responsible for Part 107 rules, airspace, and pilot certification processes.-G-8082-22

Key Concepts

What Counts as an “Airport” (and Why It Matters to Remote Pilots)

An airport is any area of land or water used or intended for aircraft takeoffs and landings, and it explicitly includes special facilities such as seaplane bases and heliports. The airport concept also covers areas intended for related buildings, facilities, and rights of way. Airports range from small sod fields to large complexes used by air carriers. For exam purposes, recognize that heliports and seaplane bases are not separate from “airports”—they are included in the legal definition and can be in your operating area ^[1]

Airports are also categorized by activity: commercial service, primary, cargo service, reliever, and general aviation. You should know the specific thresholds provided:

• Commercial Service Airports are publicly owned with at least 2,500 passenger boardings (enplanements) each calendar year and scheduled passenger service. “Enplanements” are revenue passenger boardings and include certain continuing international passengers on non-traffic stops (e.g., refueling).^[1]
• Cargo Service Airports are served by aircraft transporting only cargo with a total annual landed weight of more than 100 million pounds (“landed weight” is the aircraft’s weight on landing).^[1]

Operationally, larger commercial service and cargo hubs often host denser, faster crewed traffic and more complex procedures. For small UASSmall Unmanned Aircraft SystemCloseA small drone plus the control and communication links used to operate it., that translates to higher see-and-avoid demands and robust preflight coordination when operating near these environments.

Towered vs. Nontowered (Uncontrolled) Environments

Nontowered (uncontrolled) airports rely on pilot self-announcing over a Common Traffic Advisory Frequency (CTAFCommon Traffic Advisory FrequencyCloseThe frequency pilots use to self-announce near many non-towered airports.). Pilots conducting operations other than arrivals/departures—such as practice maneuvers or en route transitions—should monitor/communicate on the appropriate frequency while within 10 miles of the airport, unless other procedures apply. Inbound aircraft typically initiate contact about 10 miles from the airport with identification, type, altitude, position, intentions, and acknowledgement of automated weather, then request airport advisory or information service. These practices help remote pilots anticipate crewed traffic calls and patterns in nontowered airspace.^[4]

Some nontowered locations have advisory services:

• Local Airport Advisory (LAA): Only in Alaska, at airports with a Flight Service Station (FSSFlight Service StationCloseFAA-certified briefing support for weather, NOTAMs, and flight information.) on the field and no control tower (or a part-time tower). The CTAFCommon Traffic Advisory FrequencyCloseThe frequency pilots use to self-announce near many non-towered airports. is published for these airports.^[4]
• Remote Airport Information Service (RAIS): Temporary advisory support at nontowered airports for special events, requested by the airport authority.^[4]

Practical takeaway for remote pilots: Expect—and monitor for—self-announce calls around 10 miles out and within the local traffic area. Even if not transmitting, understanding this flow lets you predict when and where crewed aircraft are likely to appear in the pattern or on final.

At airports without an operating control tower, crewed aircraft use lighting practices to increase conspicuity. For example, when entering the runway for takeoff or “line up and wait,” all exterior lights except landing lights are typically used; landing lights come on with takeoff clearance or when starting the takeoff roll at an airport without an operating control tower. This increases your awareness of visual cues that signal imminent aircraft movement.^[3]

Special Facilities: Heliports and Seaplane Bases

Heliports and seaplane bases are explicitly included in the airport definition. Heliport operations can feature vertical or near-vertical departures/arrivals, while seaplane bases conduct operations on water surfaces. For remote pilots, the key is to recognize that aircraft can arrive from different approach paths and at low altitudes near these sites. Also, “airport or landing area” edges may be defined by boundary lights, and rotating beacons help identify the location at night—civil airport beacons alternate white and green, and military beacons show dual-peaked white between green flashes. These visual aids can mark both traditional airports and other landing areas you may encounter.^[1][7]

Exam Tips: Matching Airport Type to Operational Behavior

• Know the definitions and thresholds: 2,500 passenger boardings for commercial service; more than 100 million pounds of landed weight for cargo service.^[1]
• Associate “nontowered/uncontrolled” with CTAFCommon Traffic Advisory FrequencyCloseThe frequency pilots use to self-announce near many non-towered airports. self-announce procedures and 10-mile monitoring/initial calls for inbound traffic. Expect advisory services like LAALocal Airport AdvisoryCloseAn airport advisory service that can provide local traffic and airport information. (Alaska) or temporary RAISRemote Automated Information ServiceCloseA remote advisory or information service referenced in airport and flight service context. at some locations.^[4]
• Remember that heliports and seaplane bases are airports. Expect unique traffic flows and look for visual cues such as boundary lights and rotating beacons to identify active landing areas.^[1][7]