The Paradigm Signature SUB 25 looked small enough in the back of the freight truck, but by the time it was at our front door, all 150-pounds of it seemed appropriately intimidating.

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The aircraft are already designed to be changed quickly between freight and passenger use, using a large back door.

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The Aldrin Cycler can takes vehicles from Earth to Mars and back, albeit slowly, which is perfect for long-haul freight.

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"We haven't had word from freight yet and we've got to get the cars back, " McLaren boss Martin Whitmarsh said.

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During one 20-minute stretch alone, three semi trucks from FedEx Freight and a smaller truck from Advanced Logistics trundled around to the back of a distribution center owned by Quanta.

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