Mosquito spraying

Just had a airplane go over the forest opposite spraying for mosquitos so grapped the Pentax-K 300mm f4, slapped on a Teleplus 2x teleconverter that I bought brand new for $20 from another forum and snapped off a few shots.
Quite pleased with the results, very little cropping (if any on most) and hand held.

I like flying BUT this looks past it's fly by date

Nice serious.
The first one and the second OK.

Greeting
f248