Comment A near miss is defined as 500 feet (Score 1) 268
A near miss is defined as 500 feet:
http://flighttraining.aopa.org...
According to the American Helicopter Services & Aerial Firefighting Association, airtankers fly between 150 and 200 feet:
http://www.ahsafa.org/?page_id...
The article reports a drone altitude of 800-900 feet. Let's take the most pessimal separation from these numbers: 800 - 200 = 600. That gives them a buffer of 100 feet in which this was *NOT* even classifiable as a near miss; there was no danger of a drone to aircraft collision, unless you are claiming that the drone pilot intended to fly the drone into the DC-10 airtanker.
You will find elsewhere on the AHSAFA site that the aircraft do not "dive-bomb" the fires; a fully loaded airtanker had a heck of a lot of inertia, and it's not really an option; they are long, low runs. I refer you to the site however, because I doubt you'd trust my (anecdotal) personal experience with U.S. Forest Service airtankers.