For the summer schedule, CO has a few cities with twice daily service. Take for instance their flights to CDG. They have a 777 and a 762 going daily. Why don't they fly the 752 instead of the second 762. The 752 has 16 BF seats and 156 Y seats. The 762 on has a net of 2 more seats! I know the configuration of the 762 includes a slightly higher 25 BF seats but, you have over 45 BF seats on the 777.
So, why not save your 762 to service another destination like DME and send a 752 to CDG instead. The 762 has the range they need for further expansion.