Three Letter Code

Sometimes reddit grabs some great toponymy pieces. This is one of those times.

Airports are often called by their Identifier Code, a 3-letter combination. Detroit Metro Airport is called DTW while Grand Rapids' Gerald R. Ford Int'l Airport is GRR. The codes stand somewhere betweeen close-approximations and cryptic jumbled signatures.

Read the full piece: Airport ABC's - an explination of airport identifier codes.