6.3 No Transportation shall be sold directly or indirectly at a fare greater or less than the fare either published in the current tariff of the Principal or advised to the GSA by the Principal by any other means;
6.4 The GSA is responsible for the collection of the correct passenger fares as advised from time to time by the Principal;
6.5 The GSA shall account to the Principal for all amounts received by the GSA for the sales of transportation on the services of the Principal, including those made by Passenger Sales Agents in the Territory in accordance with Article 4 (j) hereof;