The document discusses several principles related to mileage for passenger fares: 1) Maximum Permitted Mileage (MPM) is the maximum distance a passenger can travel between an origin and destination, usually 120% of the shortest operated mileage. 2) Ticketed Point Mileage (TPM) is the actual mileage used to construct a particular itinerary, which can be greater than, less than, or equal to the MPM. 3) Extra Mileage Allowance (EMA) is a mileage deduction or bonus that is subtracted from the TPM as a permitted grace allowance for traveling via certain cities.

1. MILEAGE PRINCIPLES

2. MAXIMUM PERMITTED MILEAGE
• In the Fare component the Maximum Permitted Mileage (MPM) is the
first factor of mileage principle.
• MPM is basically the distance in miles which the passenger can travel
in the air between the origin and destination point.
• There is no need to calculate the MPM with the help of calculator as
usually it becomes the 120 per cent of the Shortest Operated Mileage
of that system, it is already published in PAT as well as in Maximum
Permitted Mileages book.
• For the calculation of MPM it is important to find out the Global
Indicator for the routing between origin and destination.

3. TICKETED POINT MILEAGE - TPM
• It is the actual number of miles that are used for constructing
an Itinerary between two points or cities.
• TPM can be greater, less or equal to MPM since TPM is the actual
miles that are used for constructing a particular itinerary.

4. EXTRA MILEAGE ALLOWANCE
• Extra Mileage Allowance (EMA) is a Ticketed Pointed Mileage
deduction or published bonus mileage that is deducted from the
total TPM.
• Extra mileage allowance is a grace allowance in mileage which
is permitted when traveling via a certain city (point).

5. EXCESS MILEAGE SURCHARGE
• Excess Mileage Surcharge (EMS) comes in light when applicable
EMA cannot be found in the table or it is not enough to lower
the TPM.
• In that case TPM still exceeds the MPM and it becomes
necessary to levy a surcharge. These surcharges vary from 5 per
cent to 25 per cent.