What airport code corresponds to the city of Colorado Springs?

The airport code for Colorado Springs is COS. This code is derived from the city name itself, using the first and last two letters of "Colorado" and "Springs." It follows the conventions of airport codes in the United States, which often use a combination of letters from the location they represent to create a memorable and recognizable identifier for travelers.

The other options do not represent Colorado Springs. For example, CLA does not correspond to any well-known airport, CHS is the airport code for Charleston International Airport in South Carolina, and CMH represents John Glenn Columbus International Airport in Ohio. Each of these codes is unique to its respective airport, making COS the correct identification for Colorado Springs.