The rates are simpler than those for other forms of transportation. The tariffs are put out by the Airline Tariff Publishers, Inc. as agents for the carriers. About six different tariffs are published. For example, SC 3 is a commodity rate tariff in charges per hundred pounds for minimum weights 100, 1000, 2000, 3000, 5000 and 10,000 pounds. Another example is CT 4 which is a container tariff. It applies on general and specific commodities, and presents rates about one-third off of existing rates for all weights in a container that exceed a specified amount. Other tariffs cover service transportation to the airport, local and joint airport to airport movements, and a rules tariff.