Chester County G. O. Carlson Airport (IATA: CTH, ICAO: KMQS, FAA LID: MQS) is a public airport 2 miles (3.2 km) west of Coatesville, in Valley Township, Chester County, Pennsylvania.

[3] The airport covers 352 acres (142 ha); its one runway, 11/29, is 5,400 x 100 ft (1,646 x 30 m) asphalt.

In the year ending December 12, 2022, the airport had 42,274 aircraft operations, average 116 per day: 94% general aviation, 6% air taxi and <1% military.

77 aircraft at the time were based at the airport: 58 single-engine, 11 multi-engine, 7 jet, and 1 helicopter.

The biggest project is a new 6,000-foot (1,800 m) long runway, more aligned with the usual winds at the airport.