Navy High-Speed Vessel Swift (HSV 2) has 28,000-square-foot mission deck, the ability to traverse littoral (shallow) waters, speed in excess of 40 knots, and maneuverability that doesn't require tugboat assistance when arriving or departing the pier and cargo space 17 times a C-17. A sustained 40+ knot speed would mean an Atlantic crossing in less than 3 days Possibly 2 to 2.5 days. If they could make a ship or airship that could sustain 50-60 knots across the atlantic, then we could have cheap 2nd day delivery of packages. The specs are here. It might not be able to sustain 40+ knots for an entire Atlantic crossing.