What is the correct city code for Boise, Idaho?

The city code for Boise, Idaho, is BOI. Airport codes are typically derived from the name of the city or the airport itself, with the first letter(s) reflecting the location. In this case, "BOI" clearly corresponds to Boise, following this convention by using the first two letters "BO" and including "I" to complete the three-letter sequence.

Looking at the other options, BHM refers to Birmingham, Alabama; AMA stands for Amarillo, Texas; and ABQ denotes Albuquerque, New Mexico. Each of these city codes applies to a different city, thereby making them unsuitable choices for identifying Boise, Idaho. Understanding these codes is essential for travel planning and airport navigation, highlighting the importance of accurately knowing them.