My aviation company must have had some slack rules.

Many of my pilots carried "unauthorized" sidearms, as did some of the other crewmembers. HighPowers were the most prevalent but, there were some Smith/Colt .357's carried also.
All aircrew, in my company, were given a choice of either the S&W Model 10 or a Colt 1911. Almost all chose the M10, including myself.
My Model 10 was never fired except to shoot-up the countryside.

Bruce