How to make kite line more visible? The main question is here. Other related question here.
When rising a kite even a few tens of meters, some danger might exist: low flying helicopters, utility planes, hang gliders etc. might hit or get tangled into the rope.
As the height increases, the length of the rope increases (duh!), and thus the risk of accidents.
How can I make the rope visible, or at least &quot;warn&quot; intelligent fliers that something is there to be avoided?
I think of attaching something visible to the rope every XYZ meters, so anyone could understand easily the &quot;trajectory&quot; of the rope and avoid it. What should I use? How should it be attached?
I thought of attaching some ribbons to the rope (similar to the &quot;tails&quot; of the kite), every maybe 50 meters. But they will make rising and lowering the kite difficult, and they would add greatly to the volume and length of the rope.

Note: I did not even take birds into account.

Update: As a result of the answers posted, I understood that a better solution might be to apply on the line (every X meters) something highly reflexive (maybe even fluorescent / phosphorescent): paint, silicone... So the line would look like a necklace, with the beads spaced a lot.
There should be no problem for me to mix sone transparent silicone with some reflective dust. What should that dust be?
You will find a number of kite forums on the internet. Common to many is the consideration that one does not fly in areas known to have substantial air traffic.
This includes airports and hang gliding (and paragliding) sites.
Adding tails/ribbons to the line will not increase appreciably the visibility of the kite line to pilots, but it will increase the drag both for gaining altitude and for retrieving the line. Birds may be the only entity that would benefit from flagging the line. In the past years of kite flying, I've only had line contact one time, at the beach, by a seagull and it tumbled a bit and continued on its way.
You may want to consider to ask a moderator to migrate your three questions to the engineering SE as it appears to fit that category better than Arts &amp; Crafts.
Per the suggestion of another answer-poster-person, my comment to attach a battery operated/powered emergency strobe (typically 360° visibility) will improve the visibility of a kite. Aircraft have beacons for this reason and pilots will react more effectively to such a lighting device.
Image from Amazon: