I just looked up firearms rules for Alaska Airlines. They allow one case (no limit on number of fire arms in the case). Ammunition in original manufacturers box or in a box designed to carry ammunition. If you plan to travel with a firearm where the frame can be disassembled from the gun, the frame is considered a firearm even though it has no trigger mechanism. The rules do not say the firearm and ammo cannot be in the same case. There is no mention of where magazines must travel.
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