It would suit me not to fly the last sector (within Asia to BKK) of an RTW with * Alliance. Has anyone had any come back on doing this?

Never had a problem.

There would be absolutely no problem in doing this.

You are entitled to drop a sector at any point on an RTW. However this would mean that the rest of the ticket is invalidated.

it seems the right time, again, to repeat here one of my guerilla tips (they date back to the very early days of FlyerTalk):

Using only half a ticket or not using a last segment

I would, after having done that first one-way-segment, go to the airline and ask them to please annulate my return flight, as plans unfortunately changed and I might even have to take an earlier/or possibly later flight, and I don't want to be a no-show, so that they can resell my seat a second time.

I would politly ask for a refund of my return-ticket, as I will not use it. They will politly refuse to do so.

I would ask then, if they, at least, would please credit me the miles for the return flight that I paid for, but can't use. They will politly refuse to do so.

With tears in my eyes I would than leave ...

On a round trip, after that show you might get tears in your eyes when the gonna charge you the one-way price.

I would also not request the refund due to the risk of the airline trying to reprice to a oneway flight.

I have however dropped plenty of segments. On my last RTW ticket I skipped the last 4 segments actually. (The ticket has meanwhile expired, UA ticket stock).

I would always argue that it is like in a restaurant: You order a 3 course meal consisting of starter, main course and dessert and you chose to skip dessert.
After all, you paid for the flight segment and simply chose not to use it.

I am not aware that they (the airline) ever did successfully get paid for not showing up for the last segments (or the whole return part). While they successfully cancel tickets if I miss to show up for earlier segments, even that practice is now against recent rulings of recent swiss and german courts (but airline so far don't care much about this court-decisions, knowing that a majority of costumers won't go to court).

I take that (in my opinion 0) risk, and want the airline to know that my reservation can be cancelled and make way for someone else to profit from that now empty seat - it is my part of being fair with airlines and potential but unkown costumers.

That is kind of you, however airlines factor in no-shows when selling seats on planes anyway. And if they insist on charging more for a single than a return, then they clealy expect this practice to increase no-shows and will plan accordingly.

If you are a no-show, then whether you tell the airline your intention or not won't make any difference, the only benefit for other passengers is that another waitlister will get on to the flight on the day instead of you

Much like rudi I do think that as a courtesy to fellow travelers notifying the airlines of my intention not use certain (final) segments of a journey seems only fair.

Whilst I know that airlines factor in no-shows into their booking inventory, confirmed "no shows" certainly make life easier for a) fewllow travelers, b) airlines, c) catering.

I have so far never received a negative word from lounge wardens/gate agents/call center agents when notifying them about my no show, let alone an invoice.

David