I fly in and out of Texas and Alaska a lot with rifles and handguns. For my cases, the brass bodied masterlocks with the long shackle work great. You check in with your airline, sign a declaration which you'll slip into the case and lock it up. You'll take the case to TSA where they'll swab...
Got a pair last winter. Wore them every day for a few weeks. Got several pairs now and won't buy anything else.
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