Now that's an excellent idea. Japanese airports already have such facilities for shipping almost anything to your final destination. Saved my back on the last trip, enabling me to ship a lot of heavy stuff to the other end of Japan, and enjoy my in between time without schlepping a lot of gifts.

Anyone that brings a knife to an airport at this point pretty much needs to be standing next to someone with an "I'm with stupid" t-shirt. Unless they forgot.

I still think they should have a mailbox with a vending machine that sells $3.00 priority mailers, so anything important could be mailed home.