Dear CO flyers,

As I am trying to learn more about onepass elite programs, I have the following questions! I hope these questions won't bore any of the CO experts.

I want to inquire about percentage on getting u/g on CO flights out of LAX for EWR and IAH and CLE, as an elite member of CO (silver, gold and platinum).

What will be the most difficult routes to obtain upgrade on CO's domestic network?

Thanks,
Carfield