the Southampton to New York route as a gesture to Cunard's history. The Royal Mail continues a form of this tradition on modern day airliners. The UK's flag carrier airline, British Airways, is contracted to carry mail on some of its scheduled long-distance routes. Aircraft operating these routes with the facilities to carry mail are allowed to display the Royal Mail's logo and crest on their fuselage, usually alongside their registration markings. Other designations The less-common designations RMMV for Royal Mail Motor Vessel and RMMS for Royal Mail Motor Ship, were used for a period when RMS was restricted to steam-ships. Motor Vessel and Motor Ship indicated that propulsion was provided by diesel rather than steam. The carries the designation RMV for Royal Mail Vessel and is the only active RMV. List of Royal Mail Ships Service dates are the years with the status of Royal Mail Ship. Those highlighted are still in service with the status of Royal Mail Ship. See also Union-Castle Line Mail steamer Steamboat Notes References Kennedy, John. (1903). The History of Steam Navigation. Liverpool: C. Birchall, 1903. OCLC 3553860 External links RMS Caronia "Green Goddess" Time-Line Titanic Archive Packet (sea transport) Postal infrastructure Postal vehicles Ship types Ship prefixes