We just used a flat-tip screwdriver on the boat…
This roughly http://i.ebayimg.com/images/i/270607167554-0-1/s-l1000.jpg is the type I had in my toolbox back when I worked on aircraft. Styled like a conventional screwdriver but with a short broad blade with a curved edge.
The OP’s tool is two different blades back to back (the two “mouse ears”) set 90 degrees to the handle. Which seems kinda weird and unergonomic.
Eh, same motion as using a ratchet or wrench, and the whole point of the fasteners is that the only take a quarter-turn, seems to me that the pocketability outweighs any ergonomic drawback, especially for pilots that have to keep in on their person. All the mechanics probably had/have a version more similar to yours.
I kinda want to get the screwdriver-handle version to use on those damned battery covers, to stop from scratching them up when I get one that the previous owner overtightened.