Wirelessly posted (iPhone: Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5H11 Safari/525.20)
SD is right - the only place at most airports where cash is handled is the ticket desk.
I have heard of people who mailed in the chit to customer relations and had a cheque sent, but am unaware if this is policy or a special circumstance.