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Not “off the wingtip”, the phrasing is “off the left side, maybe 300 yards or so”. Probably means captain on the left seat saw it.

The probably passed him. Like a semi truck passing a turned up moped that shouldn't be on the highway (though the semi driver would probably just laugh and not call it in).

No, I believe what happened is that the "jetpack" was either hovering or flying at low speed, and the airplane flew by it. So the pilots could see it approaching and get a visual on the jetpack before it zipped by the side.

So a relatively fixed object that they passed at speed? There is even more room there for size distortion. A doll hanging from a drone? A partially-inflated balloon of some sort? Once one person radios "jetman" then subsequent spotters will tend towards that description too.

they don't have rear view cameras?