I was bumped by Delta in December. They gave me a $400 transportation voucher for future travel. It is still valid until 12/22/07. I went onto Delta's website and tried to make a reservation. It asked me if I had an "e-credit" so I said yes. That was the only place to enter in any kind of voucher/credit/coupon code. I tried the code as an e-credit and e-ticket, but neither worked. Do I really have to go down to the airport to use this thing or am I doing something wrong?