Originally Posted by whlinder

If you're not changing the dates of the transatlantic sectors or dates of commencement of travel for each fare component, I don't understand how changing the routing or adding a free stopover permitted by the rules would trigger re-pricing.

While the fare was definitely an error (though not necessarily obvious, not that it should matter once they charge your CC), you still paid for the travel (not a $0.00 base fare). I don't see why DL should refuse to follow the rules of the ticket you bought.