Revenue passenger miles (RPMs) and revenue passenger kilometers (RPKs) are measures of traffic for an airline flight, bus, or train calculated by multiplying the number of revenue-paying passengers aboard the vehicle by the distance traveled. On long-distance buses and trains (and some planes) passengers may board and disembark at intermediate sto...
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http://en.wikipedia.org/wiki/Revenue_passenger_mile
A measure of airline traffic, a revenue passenger mile represents one paying passenger flown one mile.
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http://www.encyclo.co.uk/visitor-contributions.php
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