I don't think they are concerned about what people bring in on airplanes. They are concerned about bans on the importation of knives. I think they are concerned that if a precedent is set in this government agency it will become policy in other areas of the government. If the definition of a switchblade is changed to this proposed definition then essentially all pocketknives except slipjoints would be outlawed. Emerson knives with the wave feature would be illegal, Spyderco knives with a thumb opening would be illegal as would knives with thumbstuds, such as Benchmades. Practically all of my knives would be illegal. I think this is a case of the old Arabian proverb: "If the camel once gets his nose in the tent, his body is sure to follow."
"Be of good comfort, Master Ridley, and play the man! We shall this day light such a candle, by God's grace, in England, as I trust shall never be put out."
--Hugh Latimer, October 16, 1555