I've ridden my bike to the Denver International airport in the past. There's a nice railing outside the baggage claim that often has numerous bikes chained up to it. The city has designated a 'bike route' all the way out there, and traffic wasn't a problem when I tried it. In fact, there is a bike route sign inside the baggage claim terminal. One reason I rode up there was to see if anyone would try to stop me if I followed the bike route signs right on in... To my disappointment, no one said anything. :-)