Many thanks to everyone replying to my earlier question, this thread is a great resource for anyone planning a one world explorer itinerary. I was also wondering if anyone has experience in what happens when schedule changes and route cancellations subsequent to ticketing require an itinerary to be changed.

I have planned a DONE4 itinerary using all 16 available sectors but it wouldn't surprise me if at least one of the city pairs I'm planning ceases to be offered as a non-stop. In this case any reroute would involve adding another sector and take me over the 16 sector threshold. In such circumstances would such a change be allowed and if so would the answer be the same regardless of whether travel had commenced or not at the time of route cancellation.

Any thoughts would be much appreciated.