The International Air Transport Association is an international trade organization of airlines headquarted in Montreal, Quebec, Canada. Airlines have been granted a special exemption to consult prices with each other through this body. The organization has been accused of acting as a cartel, and many low cost carriers are not full IATA members.
IATA assigns 3-letter IATA Airport Codes and 2-letter IATA Airline Designators, which are commonly used worldwide. ICAO also assigns airport and airline codes.
They also regulate the shipping of dangerous goods and publish the IATA Dangerous Goods Regulations manual, a globally accepted field source reference for airlines shipping hazardous materials.