(ข) The sale of transportation on the regular air services of the Principal;
(c) Solicitation and promotion of sales on the regular air services of the Principal
(d) Undertaking of special publicity and promotional campaigns when so r quested by the Principal;
(e) Prominent display, as far as is practical, of the Principal's advertising, public city and display material in the windows and interiors of the GSA's offices in the Territory;