FAR 121 All Cargo Carrier 21 AIR is a certificated United States PART 121 All Cargo Carrier, with full SMS implementation compliance, under newly established commercial aviation regulations. 21 Air not only has been authorized to conduct interstate and foreign air transportation of property and mail operating Boeing 767 All Cargo aircraft but to operate scheduled cargo services between the United States of America and Mexico. AOC #: 21GA896P – ICAO code: CSB 2 letter code: 2I – IATA Prefix: 681 Call Sign: Cargo South