The act of carrying goods by air, which is normally under a contract between the consignor and a carrier. International carriage has been the subject of several international conventions: Warsaw (1929), The Hague (1955), Guadalajara (1961), Guatemala (1971), and Montreal (1975). The UK is party to a number of these Conventions, which have been given effect by the Carriage by Air Acts 1932, 1961, and 1962 and the Carriage by Air and Road Act 1979 (in part not yet in force). They deal with such matters as the nature and limit of the carrier's liability, who can sue and be sued, the right to stop in transit, the documentation of air carriage, and time limits for complaint.
Special rules apply if the goods are dangerous. The International Civil Aviation Organization (ICAO)'s Technical Instructions for the Safe Transport of Dangerous Goods by Air and the International Maritime Dangerous Goods (IMDG) Code are the two international agreements regulating the carriage of dangerous goods by air and sea.