Southwest Airlines Co Segments

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.

Cargo Ton Miles-The total number of tons of cargo transported during a reporting period, multiplied by the total number of miles cargo is flown during that period.

Cargo Ton Mile Yield- The amount of cargo revenue earned per cargo ton mile during a reporting period.

CASM- (Operating) Cost per Available Seat Mile. The amount of operating cost incurred per available seat mile 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- The amount of passenger revenue earned per revenue passenger mile during a reporting period.

RASM- (Operating or Passenger) Revenue per Available Seat Mile. The amount of operating or passenger revenue earned per available seat mile 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. Also referred to as traffic.