Round-trip flight with different airlines booked via third party - when is each airline paid? [closed]

This question comes from this accepted answer and is supposed to clarify this answer, which states that the airline is getting paid for the flight, which is booked via third party, when you check in.

However there was a discussion in comments whether this applies to all segments, and all airlines on the ticket, or only for the flights one checked in.

So the question:

If I book a round-trip flight through a third party, with forward leg on KLM and return leg on Delta, at which points KLM and Delta are being paid?

Again, this answer says "at check-in" but it is unclear whether both airlines are paid on first check-in, or each airline is being paid at each check-in.

Applied to travel, this is important to understand whether you should check in for a return leg on a throwaway ticket or not.

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Can you book a round trip with two different airlines?

Technically, you're flying on separate point-to-point tickets with separate airlines \u2014 but virtual interlining services fill in the gaps. With search sites like Skyscanner, DoHop, and Kiwi, you can get to more destinations around the world that include mixing and matching low-cost and full service airline schedules.

Does airline have to rebook you on another airline?

It is also possible to request a seat on another airline if a seat is available. "However, there are no federal regulations requiring airlines to put you on another airline's flight or reimburse you if you purchase a ticket on another airline," the DOT says.

Is it better to book with airline or third party?

You may also find out that the same flight, if booked directly from the airline, costs about the same. If that's the case with your flight, we would recommend booking directly from the airline. It's just the safest and most convenient options in most situations.

How do flights with multiple stops work?

Multi-Stop Tickets By definition, a multi-stop ticket is any ticket with more than a single destination. These tickets may include connections, simply changing planes within the day at a non-destination city, but all will offer you at least a night in more than one place.

Round trip flights are a SCAM (Usually) + Other travel hacks | Travel Thursday

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Daniel Torobekov, Jeffry Surianto, Andrea Piacquadio, Andrea Piacquadio