Visible crew/equipment: After Colonel Potter gets off the phone, he tells Klinger about Torgy Porgy and how after four years of medical school Torgy washed out, and just as Potter and Klinger stand up lighting equipment can be seen at the top right side of the screen.
Visible crew/equipment: While Major Burnham watches everyone at work in the OR, just as Charles says, "If you'd care to step over here, Major," the boom mic dips into view at the top left side of the screen.
Visible crew/equipment: In the scene following BJ's shower, when Hawkeye and BJ enter their tent, you can see the tip of the boom mic drop for a couple seconds.
Answer: The C-42 was a military variant of the Douglas DC-2. Very few C-42's were built, so it's questionable that Potter would specifically have seen that particular model, but, given his military background, it's not entirely unreasonable that he might use the military designation even when the aircraft in question is actually a civilian DC-2.
Tailkinker ★