funny, he chose one of the most heavily secured-manned airports in the country. It’s #3 or #5 in the country. They have a huge presence since 9/11.
He may have rechecked his bag in Minneapolis since he stayed overnight in Minneapolis. Now to send firearms, you need to have your ducks in a row: papers and firearm/bullets situation straight. So, I do not believe he would have picked up a firearm from another person while in Minneapolis (should that idea be brought up).