Shipping and air transport profits taxed only in the enterprise's residence; containers, integral interest, and pool participation follow residence rule. Profits from operating ships or aircraft in international traffic are taxable only in the enterprise's state of residence; supplementary container use, integral interest on directly connected investments, and profits from participation in pools, joint businesses or international operating agencies are treated as resident-state taxable under the same rule, except where containers are used solely within the other Contracting State.