Given the task definition and input, reply with output. In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

An IATA airport code , also known as an IATA location identifier , IATA station code or simply a location identifier , is a three-letter code designating many airports and metropolitan areas around the world , defined by the International Air Transport Association ( IATA ) .

An IATA airport code , is a three-letter code that can be used to identify airports .