The CO website offers three preset types of fares: "lowest available", "flexible", and "unrestricted". The description of "flexible fare" says "A flexible fare is refundable but may have restrictions such as a change fee, cancellation fee and/or advance purchase requirements." (emphasis added) And I remember seeing a slightly different description a few weeks ago which included fee-free same-day changes. I was curious. I wanted to know more. So I called the CO elite desk. "Those (flexible fares) are only available online. We can't sell them." Which just struck me as bizarre. For the routing I'm looking at, these price into Q and seem to have a fee for refunds AND changes. Does anyone have wisdom to offer?