Israel’s Elbit has successfully tested its HyDrop automated water pellet system. Israel’s Fire and Rescue Authority used two aircraft to extinguish a burning field from 152 meters up – over 4 times the standard height for aerial firefighting and twice as effective. (See this article about plane crash)

https://elbitsystems.com/pr-new/elbit-systems-successfully-demonstrates-high-altitude-high-precision-aerial-firefighting-solution/

https://www.calcalistech.com/ctech/articles/0,7340,L-3779630,00.html

https://www.youtube.com/watch?v=s7sUuL9WYzc