Welcome to FT, lware!

I'm not familiar with the specifics of onePass, but ExpertFlyer (www.expertflyer.com, $10/month, $100/year, free trial if you cancel before subscribing for five days) shows the availability of award seats on most major airlines. You can search for flights with available seats in many ways.

On airlines that offer one-way awards your husband's 15,000 miles could get him across the U.S., but CO doesn't (AFAIK) and of course he'd still have to get back. Their best use is probably for an upgrade to a paid economy ticket. On CO that's either 5,000 or 15,000 miles, perhaps plus a co-pay, depending on the fare he paid.

That said, as you spend more time here you'll see that FT is divided into forums for all major airlines and many other topics. With millions of posts and nearly 200,000 members, posting in the appropriate forum is the only way to avoid total chaos. Your question is specific to Continental, so you'll probably get better answers in its forum. You may even find that it's already been answered there. (Maybe a moderator will split it out of this thread, which is about multiple programs and thus doesn't fit a single airline forum, and move it.)