Working on airplanes isn't an activity that encourages concealed carry - between trying to fit into very small, crowded spaces and lying on your back and side to upside down, anything that adds bulk and presses crushingly against soft squishy organs and hard bruisable bone is highly uncomfortable. So I don't.
Working on installing the new parking brake cable (which is not done yet; I'm taking a break and nursing my scrapes and fresh bruises), I'm about ready to ditch all hard objects. I have key-shaped bruises on my right hip, scrapes on my arms from retrieving the 3/8th socket that slipped out of a pocket, and brand new bruises on two fingers due to the incompressibility of my wedding ring.
There may be a reason my Calmer Half's wedding ring still looks shiny and new, and mine looks like it's been through the wars, and is about to get stashed in the tool drawer right next to the sockets and wrenches. File that under things to keep in mind when looking for a holster - will it protect the gun, and will it protect me from my gun?