Note at the top of the right hand column, that when you had skies on, which meant that you didn't retract the gear, you could put an additional #100 of baggage in each nacelle. A fascinating concept!
Among other things, standard equipment included two 3-minute parachute type flares and Moonglow type instrument lights. Wowzee!!
Two of the five 18S’s were impressed by the USAAC, to become UC-45C Expeditors. They were cn 292, NC20756, which became sn 42-53510, and was later with the FAA as N20756 and NC39; and cn 316, NC2500, which became 42-22247, and was later sold to become N79911.