CO will NEVER order 763s. They were about to in 1987 and backed off when Boeing announced the 777. They are just fine with the 752 and upcoming 753 on ETOPS from EWR, 762s and 764s on EWR-Europe and IAH-Some upcoming Pacific destinations. The 764 will do IAH-HNL in the future. And the 777 doing a lot of European work. They are off just fine without the 763.
Continental did order the B767-300ER. The aircraft were due for delivery around 1993, when the airline was in the depths of financial trouble. They were never delivered, but were taken over by Vietnam Airlines. Which explains why they operate 3 B767-324(ER) aircraft.