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56 GLOSSARY Advisory Circular Instructions from the FAA on how to comply with federal aviation laws and regulations Air operations area Any area of the airport used or intended to be used for the landing, take- off, or surface maneuvering of aircraft Airside The secure area of an airport, in general, the air operations area plus all parts of the terminal beyond security checkpoints, passport controls, and customs Assistance animal A generic term that lumps service dogs and emotional support animals; not an official term under ADA or other legislation Emotional support animal Animals that provide companionship, relieve loneliness, and sometimes help with depression, anxiety, and certain phobias, but do not have spe- cial training to perform tasks that assist people with disabilities Enplanement Counting of a passenger boarding of a commercial flight General aviation airport An airport that does not meet the criteria for classification as a com- mercial service airport may be included in the NPIAS as a general aviation airport if they account for enough activity (having usually at least 10 locally-based aircraft) and are at least 20 miles from the nearest NPIAS airport Hub A very busy commercial service airport Landside That part of an airport used for activities other than the movement of air- craft, such as vehicular access roads and parking; includes the portions of the terminal outside security (e.g., ticketing halls and baggage claim) Large-hub airport An airport with at least one percent of total U.S. passenger enplanements Medium-hub airport An airport with between 0.25 percent and 1 percent of total U.S. passen- ger enplanements Non-hub primary airport An airport that enplanes less than 0.05 percent of all commercial passen- ger enplanements but has more than 10,000 annual enplanements Part 139 airport An airport that serves scheduled and unscheduled air carrier aircraft with more than 30 seats, serves scheduled air carrier operations in air- craft with more than nine seats but less than 31 seats, and is required by the FAA Administrator to have a certificate for operation Primary airport Public airports receiving scheduled passenger service and having more than 10,000 annual passenger enplanements Reliever airports A high-capacity general aviation airport in a major metropolitan area; such airports must have 100 or more based aircraft or 25,000 annual itinerant operations; the FAA officially designates reliever airports. Service animal Any guide dog, signal dog, or other dog individually trained to provide assistance to an individual with a disability Service dog Any dog that is individually trained to do work or perform tasks for the benefit of an individual with a disability, including a physical, sensory, psychiatric, intellectual, or other mental disability Small-hub airport An airport with 0.05 percent to 0.25 percent of total U.S. passenger enplanements Therapy animal Ambiguous term that can mean an emotional support animal or an animal used by a psychological or other therapist to assist with therapy Zoonotic A disease communicable from animals to humans under natural conditions
