Originally Posted by
ernestnywang
I suppose it is possible to have a recalculation of taxes, and thus a mandotory re-issue, without a change in routing, so it is not consiered a re-routing.
I used sloppy wording, sorry. By "taxes" I meant "taxes and airline-imposed fees (e.g., YR/YQ)". Changing the marketing carrier on a flight can change the airline-imposed fees. Some airlines like to recalculate the taxes for any change (perhaps in case the taxes changed?) which because of exchange rate fluctuations can be a different amount than when last ticketed.