133 airport codes—all of the places you can fly out of NYC on Delta have been illustrated by artist Celyn Brazier, to showcase something special about the city or town they depict.

https://www.adweek.com/brand-marketing/delta-revamped-its-brooklyn-dating-wall-with-133-airport-codes-to-celebrate-hometowns-outside-of-nyc/

To see the code for the major city near you (or your city, if you're lucky) go to https://www.zazzle.com/deltahometowncodes/collections where they've alphabetically put each artist representation of the 3 letter code on a shirt or coffee cup for sale... but you don't have to buy to enjoy the art of the airport code.