An aircraft designed to have a maximum seating capacity of 60 seats or less or a maximum payload capacity of 18,000 pounds or less carrying passengers or cargo for hire or compensation. A service provided by a control tower for aircraft operating on the movement area and in the vicinity of an airport. One count is made for each en route landing or departing aircraft contacted by a flight service station regardless of the number of contacts made with an individual aircraft during the same flight. A flight contacting five FSSs would be counted as five aircraft contacted. A service provided by flight service stations at airports not served by a control tower.
Itinerant operations are all aircraft operations other than local operations.
These towers may be operated by the FAA or by a municipality. The municipality has the option of using its own employees or subcontracting for these services. The first flight service station which receives a flight plan. This formula assumes that the number of departures is equal to the number of arrivals. The sum of flight plans originated and pilots briefs multiplied by two, plus the number of aircraft contacted.