I was thinking of things CO/UA were close to implementing...but yanked in the 11th hour for whatever reason. Can anyone add to this list: -Instant Hyatt Diamond status was going to be a perk of the CO Presidential Platinum Card. They even announced such at a breakout session at a CO Do. Unfortunately, the perk didn't materialize. - CPUs on Delta. Both sides worked out the technology to process elites for CO/DL on each other's metal. Which would have meant CO/DL/NW would be able to enjoy reciprocal elite upgrades across each other's equipment, with the airline's elites cleared before the other airline's elites cleared at each level. But once DL/NW got merger happy, that was all scrapped. - Supersonic service. Continental had ordered a supersonic jet ...and has a beautiful large model of it in their IAH training/simulator facility. Unfortunately, the order was never filled and the airline never had supersonic service.