Originally Posted by
millionmiler
The price is only locked in for routing reissues etc. If you want to change the price basis which would include adding continents or switching from D to A then you have to pay the local price. Call the RTW desk and ask if you continue to not believe it.
Nothing personal, but other senior posters whom I've always found to be spot-on in their knowledge of the rules have posted opposite opinions here in the not-too-far distant past. Since I was planning to do exactly that (add a continent to an existing trip) I hope they're correct.