6.1 Ali passenger transportation sold by the GSA under the terms of this Agreement shall be sold subject to the General Conditions of Carriage of the Principal, as amended from time to time, and advised to the GSA, applicable to such transportation and to the rules, regulations and instructions governing the sale and use of such transportation in force from time to time as published in the Principal's timetables, tariffs, manuals, notices and elsewhere;
6.2 No sale of transportation shall be deemed to have been made unless and until space has been reserved by the Principal, except that passenger tickets or miscellaneous charges orders may be issued where not reservations have been made, provided or miscellaneous charges orders are not issued for transportation by a particular service and are plainly marked on the face "Open Date", and in all other respects conform to the Principal's ticketing instructions;