there are only two ways in, either boat for several days down river, or aboard a jungle bus, which is what locals call the world war ii era dc-3. i've flown worse. i've been brought mere by pablo mora, a teacher at medellin university and a particular enthusiast for this classic of golden-age aviation. you've taken this flight before? >> yes. every chance i have, i come here and fly one. it's a romantic thing. >> he sees the work these hulking great airships and their pilots do, as daredevil humanitarian missions for the more remote colombians. >> they have an in-flight movie? >> no, no, no, nor first class, either.