One-Way Fare Construction with TPM (Ticketed Point Mileage)

 

One-Way Fare Construction with TPM (Ticketed Point Mileage)

1. Introduction

One-way fare construction is the process of calculating the airfare for a journey from the origin city to the destination city without including the return. This involves using published fares, calculating distances, and applying fare rules to determine the valid fare. TPM (Ticketed Point Mileage) is a key element in verifying that the selected routing is within allowable limits.

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2. Definition of TPM

Ticketed Point Mileage (TPM) is the actual flown distance between two points on a ticketed route.

• It is measured in miles or kilometers.

• TPM is used to check compliance with Maximum Permitted Mileage (MPM) and Extra Mileage Allowance (EMA) rules.

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3. Purpose of TPM in One-Way Fare Construction

• To ensure that the chosen routing does not exceed maximum allowable distance.

• To verify fare applicability according to published rules.

• To determine whether Excess Mileage Surcharge (EMS) is required.

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4. Steps for One-Way Fare Construction Using TPM

Step 1: Identify the Origin and Destination

• Determine the departure and arrival cities for the journey.

Step 2: Determine the Routing

• Identify the flight segments for the journey, e.g., direct or via one or more connecting cities.

Step 3: Calculate TPM

• Use the distance chart or airline mileage table to sum up the flown distances for each segment.

• TPM = Σ (Segment distances)

Step 4: Compare TPM with MPM

• Check the published Maximum Permitted Mileage (MPM) for the city pair.

• Cases:

  1. TPM ≤ MPM → fare is valid

  2. TPM > MPM → check EMA

  3. TPM > MPM + EMA → EMS applies

Step 5: Construct the Fare

• Start with the published one-way fare.

• Add EMS if applicable.

• Add any applicable taxes, fees, or surcharges.

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5. Example

Scenario:

• Origin: New York (JFK)

• Destination: London (LHR)

• Routing: JFK → Dublin → LHR

• Segment distances:

  • JFK → Dublin = 3,100 miles

  • Dublin → LHR = 320 miles

• TPM = 3,100 + 320 = 3,420 miles

• MPM for JFK–LHR = 3,400 miles

• EMA allowed = 50 miles

Analysis:

• TPM = 3,420 miles

• MPM + EMA = 3,400 + 50 = 3,450 miles

• Since TPM ≤ MPM + EMA → fare is valid, no EMS required

Fare Construction:

• Base Fare = Published one-way fare

• EMS = Not applicable

• Taxes/Surcharges = Added to base fare

• Total Fare = Base Fare + Taxes/Surcharges