Originally Posted by sgideons

Called in to pay AAdvantage:

Me: Hi I'd like to make a payment.
Citi: Sure, I just need the routing and account number for your checking account.
Me: I'd like to pay with a debit card.
Citi: We only allow payments from a checking account.
Me: So it's not possible to make a payment with a debit card?
Citi: No.

I didn't feel like playing agent roulette so I just went to Walmart. Neat trick if you can get it to work though.