I am looking to fly to Europe round trip and travel for about 3 months in the interim. I would be booking these round trip flights with points from a domestic (US) carrier, who does not fly to Europe, but they will place me on international airlines (there are a couple of options).
So my question is about what they call 'hidden city ticketing,' where you book A-B-C but you end your travel at B instead of C. Now the reason for this question is that the cheapest flights across the Atlantic have you landing in Moscow- which is a fair ways away from the area of Europe I would be traveling (I am getting a eurarail pass which does not include trains from Russia).
So my question is, if the domestic airline I am using my points through use "Airline 1" to get me from the US to Europe, and then uses "Airline 2" to get me back to the US, would my return flight be canceled if I were get off at the stop before landing in Moscow? So the flight would be something like NY- Paris - Moscow via "Airline 1", but I get off in Paris.
Now obviously I would have to fly out of Moscow on my way back to the US, which is fine, but since it is with "Airline 2" would that airline have any idea that I used "Hidden City Ticketing" during my arrival flight and cancel my flight home? Or since it is booked through a single airline would that have an effect?