It is a flighty 'air entrapment' boat!
I reckon it's 140mph, look how long it takes, or rather doesn't, for it to come from way in the distance, to the camera.
120mph= 2 miles/min
That far bridge has to be at least a 1/2 mile away, and it appears to take about 12-13 secs to cover the distance, and I assume it's still on the 'run up' when right back at the first bridge.
I may be wrong, but I think it's for real.
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