In 2000 I traveled between the Middle East and the U.S. alot, but my company wouldn't authorize business class. The travel agency we went through, however, used to send my airline a "DAPO" (Due All Possible) IATA code via Telex. I would go to the airline customer service counter at the airport, then mention that my travel agency had sent the code, and about 50% of the time on American, I would get upgraded. Once I even scored the coveted British Airways upgrade. Of course, I have no way of knowing what was really in the airlines' computers.

Does this code or process exist anymore?