Training wheels, I think you're out of luck.
Last June I was fortunate to fly Anchorage - Port Heiden - Sand Point - Anchorage in a Reeve Aleutian Electra (Combi). Great flights and great scenery. In-flight catering was by Subway Sandwiches!
Sad to say that RAA has since ceased ops. and I believe they were the last pax. operator of the L.188.