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All USPS "Priority" shipments go by air also, so if plane is no good for eggs carrier does not matter.
There is no "best" way to ship eggs.
Or there is?, put them on a pillow on the back seat of your Cadillac or Lincoln equipped with air shocks, and drive to destination.
Only long distance Priority Mail packages would go via air.
And the best way to transport by car is to hang the eggs in a net from your auto ceiling so they do not experience lots of vibration. The next best way is in a bucket of sand on the floor in the back seat.