# City Codes

This term is referring to the three-letter city code for a city. If a city has an airport, it has one of these codes.

One way to find the city code for a particular city is to telnet to madlab.sprl.umich.edu port 3000, hit Enter, select option 1, then option 3.

Another way to figure out the city code is just to look through a list of city/city-code pairs yourself.

Some common city codes that people seem to be confused about:

San Francisco
  SFO
San Jose
  SJC
New York City
  NYC

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