Premise: Zunyi Xinzhou Airport (IATA: ZYI, ICAO: ZUZY) is a dual-use military and civil airport serving the city of Zunyi in China's southwestern Guizhou Province. It is located in the town of Xinzhou in Xinpu New Area. The military air base was built in 1966 and completed in 1970.
Hypothesis: Zunyi Xinzhou Airport took 4 years to build.