Caledonia County Airport (IATA: LLX, ICAO: KCDA, FAA LID: CDA, formerly 6B8) is a state-owned public-use airport located three nautical miles (6 km) north of the central business district of Lyndonville, a village in Caledonia County, Vermont, United States.

[2] Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, this airport is assigned CDA by the FAA and LLX by the IATA[3] (which assigned CDA to Cooinda, Northern Territory, Australia[4]).

Caledonia County Airport covers an area of 78 acres (32 ha) at an elevation of 1,188 feet (362 m) above mean sea level.

It has one asphalt paved runway designated 2/20 which measures 3,300 by 60 feet (1,006 x 18 m).

[1] For the 12-month period ending December 12, 2007, the airport had 4,690 aircraft operations, an average of 12 per day: 97% general aviation, 2% air taxi and 1% military.