You can generally tell when the true operational cost, including cost of capital, significantly exceeds employee cost by looking at whether they pay people to work in the middle of the night.
There are quite a lot of places where that happens. Just using the OP's list:
Airplanes: there are fewer flights at night, but that's when a lot of required maintenance happens. The Internet tells me the average lease on a Boeing 737 is around a few hundred thousand USD per month. Bigger planes would have even bigger differentials with their crew salaries.
Machinists: there's a reason you picked this example. Really expensive machine tools can run into the multiple millions though, plus maintenance and consumables. Lease rates can easily go into double digit thousands per month. And that's not even considering exotic stuff. Lots of high end shops operate around the clock.
Radiologists: Most of the operating costs for big medical imaging equipment are going to exceed the employee operating it, though maybe not the radiologist. Getting a radiologist to work outside regular business (or banking) hours is a chore, but the techs do so routinely. Sometimes the actual operation is the expensive bit so no night shifts, like anything involving a SQUID.
Tower cranes: don't work as much at night probably due to safety, but lease rates mostly in the double digit thousands a month and up.
Trading analysts: Bloomberg terminals are a few tens of thousands per year, so no. Some of the crazy HFT stuff probably does cost ridiculous amounts though, so maybe the quants writing algorithms for it rather than the traders.
Garbage men: maybe. Probably yes if you count the salary of one guy, no if two.
Concrete truck drivers: probably. Also probably semi trucks.