It’s possible. Some outfits require their protective details to keep a round chambered. The issue, however, is that all manufacturers of such trigger locks state unequivocally thou shalt not use a trigger lock on a loaded weapon. The reasons for this are obvious. That being said, if the front office weasels in TSA have an established policy contrary to common sense that clearly creates a situation leading to injury or death, you either ignore the rule, or opt out of the program. As a pilot, one would be free to choose the latter, and continue a happy care-free career flying the friendly skies. To do nothing means one hasn’t thought things through, and therefore shouldn’t be carrying a firearm.
Thanks. Good comments.