... Notably in the 'States, there were some people "Armed" on Flights,as early as '74 that I'm personally aware of . Now, whether the "Glaser" was developed specifically for "Aircraft", use I really don't know. The "Blue Tipped"( Flat at the actual tip) version had the "shot" supposedly, suspended in liquid Teflon, and were touted as a "Surgeons Nightmare"! .... 'Shot a couple in 38 Special, 380ACP and 45ACP, no feeding problems encountered. .... Ingenious concept, but as previously posted, VERY Expensive ! ... David K