Delta Airlines 2009 Annual Report Download - page 56

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Table of Contents
Glossary of Defined Terms
ASM—Available Seat Mile. A measure of capacity. ASMs equal the total number of seats available for transporting passengers during a reporting period
multiplied by the total number of miles flown during that period.
CASM—(Operating) Cost per Available Seat Mile. The amount of operating cost incurred per ASM during a reporting period, also referred to as "unit
cost."
Passenger Load Factor—A measure of utilized available seating capacity calculated by dividing RPMs by ASMs for a reporting period.
Passenger Mile Yield or Yield—The amount of passenger revenue earned per RPM during a reporting period.
RASM or PRASM—(Operating or Passenger) Revenue per ASM. The amount of operating or passenger revenue earned per ASM during a reporting
period. Passenger RASM is also referred to as "unit revenue."
RPM—Revenue Passenger Mile. One revenue-paying passenger transported one mile. RPMs equal the number of revenue passengers during a reporting
period multiplied by the number of miles flown by those passengers during that period. RPMs are also referred to as "traffic."
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