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Brockville - Thousand Islands Regional Tackaberry Airport (CNL3/XBR) is a small uncontrolled aerodrome serving the town of Brockville on the St Lawrence River in eastern Ontario, close to the Thousand Islands. It offers a hard-surfaced main runway alongside a shorter grass strip, making it accessible to a range of light aircraft on VFR flights along the river corridor.
CNL3 is a small regional airport at Brockville, Ontario, positioned amid the Thousand Islands stretch of the St Lawrence River. It combines a lit hard-surface runway with a shorter lit grass strip, and its proximity to the international border and CANPASS customs clearance make it a practical stop for cross-border general aviation traffic as well as local training and club flying.
The airfield lies in uncontrolled Class G airspace over Brockville, Ontario, within the area worked by Montreal Centre. There is no on-field air traffic control tower, and pilots operate using the aerodrome traffic frequency and self-announce procedures typical of Canadian uncontrolled fields.
CNL3 has two physical runways. Runway 04/22 is 4471 feet long with a hard surface and is lit, providing the primary landing and departure runway for most traffic. Runway 16/34 is a shorter 2214-foot grass strip, also lit, suitable for lighter aircraft and offering an alternative alignment depending on wind.
Pilots can reach Montreal Centre on 134.675 MHz for the aerodrome/discrete frequency, while an automated weather observing system broadcasts on 118.525 MHz. Local traffic and unicom calls are made on the aerodrome traffic frequency/UNICOM at 123 MHz. There is no ILS or other instrument approach aid at the field.
As an uncontrolled aerodrome, arriving and departing traffic is expected to make position and intention calls on the 123 MHz ATF/UNICOM frequency, coordinating with any other traffic in the vicinity to maintain separation and sequence for the active runway.
The airport is identified as a site with flying club activity and is equipped for CANPASS customs clearance, allowing it to serve as an entry point for aircraft arriving from the United States. Its mix of a paved runway and a grass strip supports both routine training operations and general aviation movements in the Thousand Islands area.
