Bayannur Tianjitai Airport (IATA: RLK, ICAO: ZBYZ) is a regional civil airport serving Bayannur, a prefecture-level city in the Inner Mongolia Autonomous Region of China. It provides air connectivity for the Hetao Plain area, an agriculturally significant region known for its Yellow River irrigation systems. The airport operates domestic routes primarily connecting Bayannur to major Chinese cities such as Beijing and other regional hubs. It serves a relatively modest passenger volume reflective of the city's size and regional economic activity. As with many smaller Chinese regional airports, it is managed under the framework of civil aviation authorities and has supported local economic development and accessibility for residents of the surrounding area.