I have read the FAQ's and done various searches and just wanted to make sure I understand the rules of a XONEX ticket.

I am planning a RTW trip for Sep 2006, and am planning to travel to Japan, China, Hong Kong, South East Asia, Australia and North America/Canada, departing from LHR.

1. This itinerary would require a xONE3 ticket, correct? Also, are there any limitations on the xONE3 compared to xONE4 (apart from the number of continents)?

2. Do you have to declare all the flights you wish to take, including internal flights in each continent? e.g. I couldn't just declare the flights between each continent and then decide along the way I want to take a plane from Hong Kong to Bangkok?

2a. Assuming you declare all the flights you plan to take, if you decide to cancel one (an internal flight, not trans-continent which I assume are non-cancellable), does this cost anything, and does it affect any further flights you have declared in that continent?