I don't know what a backcharge is but NW would not have been charged anything for you using DL. Delta would just get the revenue instead of NW from the TA.
And since they are soon going to be one airline soon, it all goes in the same pocket anyway. As I said before (you know what I mean) I would have happily printed your ticket for the 50usd charge and sent you down to DL. Next time call your agent to blame them, not the airline guy/gal who is there to try to work with you within the rules of the ticket.
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