CO does have reasonable fares on this route, as long as you book more than a few days in advance and you're staying at least 3 days (I see lots of $158 round-trip fares in October, for example). The expensive fares only show up when you book close-in tickets, or if you're trip is less than 3 days. I'm sure CO will match whatever fare rules B6 uses on this route, so that will probably be a good thing for consumers. But I'd also bet that CO will do its best to defend this route by adding extra seats. They could add lots of seats by simply replacing the 735s with 738s.