NO HILTON, NO PAN AM. The DeKalb Municipal Band offers a weekly concert in the park. Tuesday's program included Johann Strauss's Blue Danube. It is difficult to listen to that without envisioning that Pan Am shuttle docking with that orbiting wheel with Hilton accommodation, which we were supposed to have by now, if life imitated art. Or, if there had been more commercial freedom for space exploration starting, say, in 1967.