Old Oct 14, 19, 1:33 pm
  #6  
Often1
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Join Date: Aug 2010
Location: DCA
Programs: UA US CO AA DL FL
Posts: 48,094
While it is terrible customer service, NH was justified in collecting the fee because AC did not (and with good reason). It is unusual for an onwards carrier to do this, but not unheard of.

Rather than NH, I would approach AC for the refund. Presuming that your carry-ons were :"legal" it was simply an unfortunate circumstance that there was no room for the bags. But, AC should have absorbed the additional cost and did not. While I would not hold my breath for AC to refund the excess baggage fees, it is AC which should have dealt with the issue and did not.
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