I've sharpened a couple down to almost a scribe like that... tool many years, and like you say, they are easy to get use to over a long period of time...
Airports don't throw them away... They are collected, sorted, bagged up and sent to the major hubs. There they are resorted and sold, at auction in large lots, Check GSA auctions... they come up often... lots of folks loose their knives this way... some very expensive at that... :smile:KennyV