I’ve never really had a “desk job” where my job was to sit at a desk 9 to 5. But a few of my past occupations included at least some desk time, such as:

• Flight instructor. Most of my day was spent either in the classroom briefing/instructing, or in the plane instructing/overseeing. I spent a significant portion at a desk creating lesson plans, updating logbooks, communicating with students, grading assignments, communicating with other instructors, communicating with our Designated Pilot Examiner, filling out FAA paperwork, that sort of thing.
• Aviation mechanic. This is more of an administrative job than the posters at your local trade school would lead you to believe. An owner/operator/pilot/plane haver guy brings you a plane for an annual inspection, now you have a research project. What exact make and model is this thing? What modifications has it had during the 50 years it’s existed? Under what authority were those modifications made? Is it still in original or correctly modified condition? Are there any manufacturer service bulletins or FAA airworthiness directives issued for this aircraft, and I mean THIS aircraft, or its components? Like, they’ll call out ranges of hull numbers in these things. Then there’s recording all the shit YOU did to the plane while it’s here.
• Project manager of a short-run job shop. First up: Meet with the customer and massage the idea they have out of their brain. 3 times out of 10 tell them which aisle in Wal-Mart they can find what they want, 1 time out of 10 explain why what they want isn’t physically or technologically possible. Once I’ve got a good idea of what the customer wants, it’s time to do some preliminary design work, research materials and prepare an estimate, deliver this to the customer. 7 in 10 times we hear back from that, get the okay to build, now it’s time to order materials, do any of the design work which may include CAD design, electrical design, computer programming, whatever. Scheduling and directing my team, contracting with any talent I don’t have in-house, the all important staring at a wall visualizing fourteen different variations on some little yet pivotal detail, and then I’d end up in the shop running laser cutters or lathes or table saws or whatever to get it built. Then the most important part: Invoicing the customer.