Dear BA and all,
Denver would be an excellent choice for JetBlue. It has a big population base, sits atop two interstates, and is in the middle of its state. The DL 757 you mention probably feeds DL's international fights at JFK so it wouldn't compete with JetBlue.
But given David Neeleman's choices of Ontario over LAX and Oakland over SFO, you'd probably see JetBlue land at Colorado Springs. Either way a good choice.
Why JB chose Salt Lake so soon, before say BWI, MDW, or MIA is a mystery to me. Maybe they lobbied him heavily. Rochester's congressional delegation lobbied JetBlue heavily, which I think helpd us land them so soon.
Need a new airline paint scheme? Better call Saul! (Bass that is)