They can't keep a jet pack in the air for more than a few minutes. No skateboard is going to do it.
Thought it was coolest thing ever when Marty McFly had one.
Actually the US military tested jet packs as an supplement to helicopters as far back as the 60's and managed to get 15-20 minutes of flight time with various technology. Of course without links I am making this up so I will see if I can dig that up. Personal flight has always been a fantasy of mine.