Upvote:1
Answering questions like this in the negative is very hard because you need to provide sources that something doesn't exist :) but indeed such tickets do not exist. Swiss, Lufthansa and Air Berlin flies this city pair but that's almost irrelevant as no airlines offer such.
Upvote:4
There is one airline that sells roundtrip tickets in bulk, Aeroflot. You can only purchase a bulk ticket between Moscow and other Russian cities. First roundtrip leg will be with a fixed dates, subsequent are open dated. You can buy 4-16 roundtrips, with some discount for bulk purchase. Here is their web page with more details (in Russian only):
http://www.aeroflot.ru/cms/special_offers/business_travel
Just found a similar American Airlines program:
So it really depends on the individual carrier