Originally Posted by christep
I concur that it is clearly against the rules. If you have an e-ticket then you almost certainly won't get away with it (will be trapped at check-in for the first Europe sector). On a paper ticket with the reservations separate from the ticketing I reckon you would get away with it with negligible chance of problems. Having said that, if someone catches it you haven't got a leg to stand on.
I agree, and find the above best in line with previous threads. If in the past the more or less consensus here has been 'throw it away, no worries' (with the e-ticket caveat), then I don't see why this case is different just because it involves a transoceanic segment. What I am trying to say is that to throw away a SYD-MEL coupon is just as 'bad' as a doing away with a JFK-LHR one (you are altering the itinerary without a reissue), so in -that- sense any transoceanic rules are irrelevant.