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my understanding of leg , sector and itinerary...

 
naidu bs
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See the following analysis for a user who wanted to travel from BANGALORE to London Heathrow. Let us say , it as a return journey. For this , we have got the following Itinerary from his travel agent.
Outward Journey:
Bangalore to BomBay , BomBay to London.
Inward Journey:
London to Colombo,SriLanka Via Male (Maldieves), Colombo to Bangalore..
Flight will stop in Male but passengers are not required to change flight and Only passengers who wanted to go to Male are allowed to get down the flight, remaining passengers (those who wanted to travel Colombo and Bangalore) are expected to sit in flight only.

As per my understanding, the following is the terminology.

Leg: This is a logical travel that user is intended to do. Means, the following are his planned legs.
Bangalore to London , London to Bangalore (irrespective of change flights and stops).

Sector: Real time flight journey between two points. In this example, the following are sectors.
Bangalore to BomBay, BomBay to London,
London to Colombo, Colombo to Bangalore (those who wanted to travel Colombo and Bangalore)
London to Male, Male to Colombo (for Male passengers).

If you see, stop in "Male" called as "Touch Down" for those who wanted to travel between London to Bangalore. This will not be considered as sector while prinitng the intinerary.

Itinerary: this whole return journey break up at detail level is called called itinerary.

If terms of relation between these objects,
Itinerary will one or more Legs.
Each Leg will have atleast one sector.
Each sector may or may not have a touch-down. Each sector will have a physical Flight.

Each flight is will belongs to type like ATR or Boeing. this is called equipment type.


Hope this correct and clarifies some of your clarifications.. anyways i will be updating these things as my assmptions.
 
Shabbir Kothawala
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Hi,

My understanding of leg is different

As per example given at http://gennick.com/?q=flight

Plane QF1 that flies from A to B, and then on to Z.

Plane QF2 that flies from A to Z directly, and then stops.

Plane QF3 that flies from D to E to F, and finally to Z.

Each hop from one point to another is called a "leg". For example, flight QF1 consists of two legs: from A to B, and from B to Z. Flight QF2 consists of a single leg, whereas Flight QF3 consists of three legs

Segment
Here I am really confused as there are different meaning used by every airline

As per defination of Southwest airline it says "One take off and landing during air travel constitutes a segment"

This means that segment is no difference then leg.

If this is the case then how to handle the change flight as per use case. As per use case a user can select segment to change and that means if your flight from departure to arrival consist of multiple leg then you can select one of the leg and change the its flight. This I never see in any airline. The airline only allow to change the entire route i.e from departure to arrival

Any thoughts on this

Thanks,
Shabbir
 
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