re: "oneworld" award (140K/280K/420K) Planning - The Definitive Thread
Not necessarily... Taxes change over time (ie. go up!) so the taxes applicable at the date of the original booking may not be the same as those today - and I'm pretty sure they'll use the latest taxes and rates if you change your itinerary even if it's just the dates. Also, if you're dates are changing you could be changing a stop over into a transit (or vv) in which case different taxes may be levied.
Not sure what happens if the rules about points change between the original booking date and the date of the change - suspect the original conditions at the time of booking would apply, so no change there, but happy to be corrected.
