Electronic travel certificates. Certificates are now redeemable on united.com. One case worth noting - certificates still cannot be redeemed online when the total price of the ticket is less than the value of the certificate (Resolved)
Not resolved. I had a $500 CO ETC from Feb. Used it online for a $154 flight and the website handled it as normal. Got the email, wait for ticketing etc. But then the reservation page gave an error "This reservation is not ticketed. Complete this purchase now." An agent saw there was no ETC pin, and attached it, the flight ticketed right away. But the ETC then showed the price of the ticket was deducted twice.
Now I have an agent painfully trying to fix it. Get your programmers to set up a tool to transfer ETCs to travel bank. The travel bank actually works.