Hi there,
Elizabeth here from Rewards Network. I'm sorry to hear about a negative experience at Manganaro's. Mangaro's is a participating restaurant on both the Rewards Network and American Airlines dining programs. As part of their agreement with us, Manganaro's is supposed to accept credit cards. This NYC institution has a history that dates back to 1893--but that's no excuse for taking cash only! I am looking into this issue and will hopefully have some news soon.
Thank you again for dining with us!
Elizabeth