Ive used my Pintler with full frame as a carry on several times with no issues. And when doing so, it's generally filled with shooting bags, optics and has a tripod strapped to the side of it, so not exactly compressed down either.
The only time I was ever nervous was on a southwest flight...
ZT 0300 that I've carried for years. Solid knife, bummed they discontinued them, as I'd like to have a backup but they usually sell for a premium on the forums as a result.