IATA airport code
An IATA airport code, also known as an IATA location identifier, IATA station code, or simply a location identifier, is a three-letter geocode designating many airports and metropolitan areas around the world, defined by the International Air Transport Association (IATA). The characters prominently displayed on baggage tags attached at airport check-in desks are an example of a way these codes are used. 

The assignment of these codes is governed by IATA Resolution 763, and it is administered by the IATA's headquarters in Montreal. The codes are published semi-annually in the IATA Airline Coding Directory.

IATA provides codes for airport handling entities, and also for railway stations. "Click here for list of IATA railway station codes." 

Alphabetical lists of airports sorted by IATA code are available. A list of railway station codes, shared in agreements between airlines and rail lines such as Amtrak, SNCF French Railways, and Deutsche Bahn, is available. However, many railway administrations have their own list of codes for their stations, such as the list of Amtrak station codes.
Q568407
location identifier
Concept
Q36214810
geocode
UNK
Q1248784
airport
Concept
Q1907114
metropolitan area
Concept
Q19755
International Air Transport Association
ORG
Q4841378
baggage tags
UNK
Q340
Montreal
LOC
Q3565868
railway
Concept
Q1655167
Click here for list of IATA railway station codes
UNK
Q1077844
Alphabetical lists of airports
UNK
Q1655167
list of railway station codes
UNK
Q23239
Amtrak
ORG
Q13646
SNCF French Railways
ORG
Q9322
Deutsche Bahn
ORG
Q3249789
list of Amtrak station codes
UNK
Q192824
IATA airport code
Concept
instance of
standards body
subclass of