Most of our equipment come from Germany, Switzerland and Italy, so are the tools. We rarely see Snap On tools around the plants and many Proto, old S-K, and whatever McMaster Carr sells. Recently a lot of Gearwrench.Depends upon how big of a company you are. When I worked for Westinghouse at the R&D Center in my native Pittsburgh all of the hand tools were Snap-On and they got whatever I wanted from Snap-On and at rock bottom prices. Of course when you spend $1M a year on tools, which I'm sure Westinghouse did worldwide, you deal directly with Snap-On Corporate and not some dude on a tool truck. I would imagine that companies such as Boeing would have a similar blanket sales agreement with Snap-On.
We don't buy from Amazon. Mechanics request tools based on the work they are assigned to, the MRO stores go out buy from whoever their contracted vendors.