For the summer schedule, all 10 762s are on longhauls each night. The other one is overnighting in IAH, after coming down from EWR as CO63 in the afternoon. It probably then acts as spare, or is doing light maintenance before going back to EWR next day.

The 762 is the hardest working plane in CO's widebody fleet, and I'm sure the whole fleet too:

http://www.flyertalk.com/forum/showthread.php?t=680812

During the summer, 9 planes are on longhauls each night, and one at IAH. The only down time are the two daytime layovers in GRU and EZE.

As for EWR-IAH, one pair is between the continuation of EZE service. One pair (CO49, CO152), is after the GRU comes back to EWR, and before night-time EWR-Europe run. Another plane comes down from EWR to IAH as 63, then overnight in IAH, presumably for maintenance.

Why not put on other routes?

I can think of these reasons:

- They can do maintenance
- They can protect the other routes better from a hub if a plane has mechanical
- The 762 has more seats in front than any other CO domestic fleet. There's enough premium traffic as is between the hub - ask the plats what are their EUA success rate.