AdjudiCor
The LA-240 PSN is the crop-duster version of the AdjudiCor fighter, fitted with a sprayer for the PG-240 chemical used on tobacco fields. It also keeps guns, rockets and bombs.
It carries the widest loadout of the LA-240 family. The poison sprayer adds an area attack on top of the usual guns, rockets and bombs.
Steal one and land it at a pickup point that takes planes. Expect to find them around Madrugada's tobacco country.
Like every armed plane, it is limited by anti-aircraft sites. Take those down before flying it far.