In my email today from a Tech site.  They do have a prototype and it is going be demo'ed in CES.   (Was going but life intervened..SIGH )

Fly For HOURS!!

woow, that would be great!

Looks interesting.

DRONExpert have a battery rack and tether.

http://dronexpert.nl/camera-lift ... re-and-matrice-100/

I heard about this. Sounds promising as you can charge home.

Also, I saw a new 6 cameras drone navigation system that looks very smart to keep the drone out of trouble.

I like to take a short break, inbetween my 4 consecutive intelligent flight battery flights.
So the ability of flying for several hours at a time, wouldn't always be any advantage to me.

But for some, it may be the icing. . . Finally having your cake and eating it too. Ha

RedHotPoker

Hmm, That system might have a limited appeal to some, but I figure it would be a very small section of drone flyers. For the work I do it would not be suitable. And as RedHotPoker says, I don't need the strain of flying for hours.