There's an Uber for Air Freight business in that somewhere. Pair people who want cheap next day delivery on a package and people who are flying but not checking any luggage.
Japan has cheap next day delivery for parcels. You can even send food such as fresh sashimi in chilled containers (and it will arrive cold and carefully handled). Of course, smaller country with a culture of good service.
You don't need to go to Japan for that. Many years ago I ordered fresh lobster from Massachusetts to Minnesota, it arrived packed on ice and still alive.
Great idea but don't NA air transport regulations require you pack your own luggage? I certainly got asked that multiple times last time I went from Europe to NA.
I wonder if that's an actual requirement, or whether answering no will just guarantee a baggage search. You could also receive the goods and then pack them yourself to avoid that.
