10, 20, 50 or more aircrafts doesn't matter. They all have to answer the following:
ASM— Available Seat Mile. A measure of capacity. ASM’s 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.
RPM— Revenue Passenger Mile. One revenue-paying passenger transported one mile. RPM's equal the number of revenue passengers during a reporting period multiplied by the number of miles flown by those passengers during that period, RPM’s are also referred to as “traffic”.
Yield— The amount of passenger revenue earned per RPM during a reporting period.
RASM— Operating Revenue per ASM. The amount of operating revenue earned per ASM during a reporting period. RASM is also referred to as “unit revenue.”
PRASM— Passenger Revenue per ASM. The amount of passenger revenue earned per ASM during a reporting period. Passenger RASM is also referred to as “unit revenue.”
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”.
LF-- Passenger Load Factor — A measure of utilized available seating capacity calculated by dividing RPMs by ASM’s for a reporting period.
