I read:

I couldn't find the definitions of stages and sequences. What are the definitions of stages and sequences and how do they compare against leg/portion/sector/segment?

Here are the IATA definitions I could find on dividing up the trip and dividing up the money:

Term Name Description Source of Description
Coupon The portion of the Passenger Ticket and Baggage Check or Excess Baggage Ticket that indicates particular places between which the coupon is good for carriage.
Leg The space between two consecutive scheduled stops on any given flight. IATA,PSCRMe34,CHPT 1,RESO 766
Leg The operation between a departure station and the next arrival station. IATA,SSIMe38 (2011),CHPT 1.1,RP 1761b
Portion One segment or consecutive segments (even though gap intervenes) via any one Member. IATA,Reso766
Sector (see "Leg") IATA,SSIM,RP1761b
Segment A leg or a group of legs from boarding point of a passenger to a deplaning point on a given flight. IATA,PSCRMe34,CHPT 1,RESO 766
Segment (Sometimes referred to as City Pair)  The operation between board point and any subsequent off point within the same flight. IATA,SSIMe38 (2011),CHPT 1.1,RP 1761b
  • 4
    I feel that this series of questions goes beyond the scope of Travel Stack Exchange. Not using the closing hammer but I did vote down.
    – Willeke
    Jun 15 at 17:42
  • @Willeke thanks for the comment, I think this is important for travelers to properly understand the terminology around tickets / flights (e.g., to understand the rules that applies to a ticket, such as "PAX /C1-4 NON END/CHNG PENALTIES AS PER RULE", or when discussing with airlines' employees). Jun 15 at 18:14
  • 2
    it's really not. If you're having an argument with customer support about change fees, demonstrating your knowledge of what a stage is will not change anything Jun 16 at 0:53
  • 2
    This question makes my head ache just looking at it, never mind trying to read it. I cannot imagine any circumstances in which it would be useful to know the answer.
    – Traveller
    Jun 16 at 5:51
  • 1
    There's no guarantee that the airline you're corresponding with uses these terms internally as defined by IATA (and even if they do, individual staff members might not know them to this level of detail). Jun 16 at 19:57

From https://www.lot.com/cy/en/conditions-of-carriage (mirror), the term "sequence" designates the order of the flight coupons:

The carrier’s fares require that the passenger should travel the respective journey segments in the sequence in which they are reflected in the ticket. If the passenger intends to travel disregarding the original sequence of journey segments, he/she should change his/her ticket in accordance with his/her actual journey intention.

The document on the Main terms used in civil aviation statistics by the ICAO (mirror) defines a flight stage as follows:

Flight stage. A flight stage is the operation of an aircraft from take-off to its next landing. A flight stage is classified as either international or domestic based on the following definitions: [...].

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