Cedar Rapids Eastern Iowa Airport (CID) is an airport located in Cedar Rapids, Iowa. It is the second-largest commercial airport in the state of Iowa, serving the Cedar Rapids area since 1936. The airport is also known as The Eastern Iowa Airport, due to its location in the Eastern part of the state.

The airport was originally established in 1936 as a public facility for the city of Cedar Rapids, and was initially known as the Cedar Rapids Municipal Airport. The airport was initially served by four airlines, including United Airlines, Northwest Airlines, American Airlines, and Trans World Airlines. It was the first airport in the state of Iowa to have a paved runway, with a total of six runways.

In the early 1970s, the airport underwent a major renovation and expansion, and was renamed the Cedar Rapids Eastern Iowa Airport. The name was chosen to reflect the airport's location in the Eastern part of the state. The airport was also given an airport code, CID, which stands for Cedar Rapids Eastern Iowa.

At present, Cedar Rapids Eastern Iowa Airport serves an average of 15 flights a day. The airport is served by several major airlines, including American Airlines, Delta Airlines, United Airlines, and Southwest Airlines. The airport also serves several regional carriers and charter airlines.

The airport has seen a significant increase in passenger numbers over the past few years, and plans are currently in place to expand its facilities and services. The airport is currently undergoing a major redevelopment project, which will include the expansion of its runways, the construction of a new terminal building, and the installation of new security and technology systems.

In addition to its commercial use, the airport is also used for general aviation purposes and is home to a number of flight schools and air charter companies. The airport also serves as a base for the Iowa Air National Guard's 132nd Fighter Wing, which is part of the United States Air Force.

The Cedar Rapids Eastern Iowa Airport is an important hub for transportation in the state of Iowa, and provides a convenient and efficient way for passengers to travel to and from Cedar Rapids. The airport provides a variety of services, ranging from passenger transport to cargo transport, and is a vital link between Cedar Rapids and the rest of the world.