What is the ICAO airport code for New Orleans Louis Armstrong?

The ICAO airport code for New Orleans Louis Armstrong International Airport is KMSY. This code follows the ICAO (International Civil Aviation Organization) format, which utilizes a four-letter alphanumeric designation. The 'K' at the beginning indicates that the airport is located in the United States, while 'MSY' specifically designates Louis Armstrong International, linking the airport to its location in New Orleans.

Understanding ICAO codes involves recognizing how they are structured. For example, codes starting with different letters represent other countries or regions. The other options provided correspond to different airports: KNEW is for New Orleans Lakefront Airport, KJAX is for Jacksonville International Airport, and KJAN is for Jackson-Medgar Wiley Evers International Airport in Mississippi. By knowing these distinctions, it becomes clearer why KMSY is the correct answer for the New Orleans airport.