Southwest Airlines 2015 Annual Report Download - page 49

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(6) Seats per trip is calculated using seats flown divided by trips flown. Also referred to as “gauge.”
(7) Calculated as passenger revenue divided by revenue passenger miles. Also referred to as “yield,” this is the average cost paid by a
paying passenger to fly one mile, which is a measure of revenue production and fares.
(8) Calculated as operating revenues, excluding special items, divided by available seat miles. Also referred to as “RASM” or “operating
unit revenues,” this is a measure of operating revenue production based on the total available seat miles flown during a particular
period. Year ended 2015 RASM excludes a $172 million one-time non-cash special revenue adjustment. Additional information
regarding this special item is provided in the Note Regarding Use of Non-GAAP Financial Measures and a reconciliation of revenue
excluding special items related to accounting changes in the accompanying pages.
(9) Calculated as passenger revenue divided by available seat miles. Also referred to as “passenger unit revenues,” this is a measure of
passenger revenue production based on the total available seat miles flown during a particular period.
(10) Calculated as operating expenses divided by available seat miles. Also referred to as “unit costs” or “cost per available seat mile,” this is
the average cost to fly an aircraft seat (empty or full) one mile, which is a measure of cost efficiencies.
(11) Aircraft in the Company’s fleet at end of period, less Boeing 717-200s removed from service in preparation for transition out of the
fleet.
(12) Refer to Note 1 to the Consolidated Financial Statements for additional information regarding the impact from the July 2015 amended
co-branded credit card agreement with Chase Bank USA, N.A.
41