Twin Pine Airport (FAA LID: N75), originally called the Pennington Airport, was a privately owned public-use airport located on Pennington-Lawrenceville Road three miles (4.8 km) southeast of the central business district of Pennington, in Hopewell Township, Mercer County, New Jersey, United States. The airport was established in 1945 and is an example of a municipal government's desire to appropriate property for its own use using taxation methods as an alternative to eminent domain.

Twin Pine Airport covered an area of 52 acres (21 ha) and contained one runway designated 12/30 with a 2,200 x 100 ft (671 x 30 m) turf surface. For the 12-month period ending December 31, 2006, the airport had 12,000 general aviation aircraft operations, an average of 32 per day. At that time there were 15 aircraft based at this airport: 73% single-engine, 7% multi-engine and 20% ultralight.

The airport had a single grass runway and was considered historic. It was home to many aircraft in its years, such as the famed Boeing 450 Stearman, nicknamed the "Red Baron", which regularly gave rides in and out of the airstrip. Charles Lindbergh frequented the airport during the time he lived at Highfields. In more recent years, some aircraft were left at the airport after its closure. These include a Cessna 150, a Varga Kachina, a Citabria, a Mooney M20C, and a Cessna 310.

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