Use of Fighter Jets on Pandora

Why dont the RDA use fighter jets on pandora, they clearly have the space and the infustructure as seen in Bridgehead City. I realize that the maintenence would cost a lot but why dont they use like an 21 century design like from the same era as, the Sa-2 Samson this would reduce maintenence costs as the plane wound not need to be put throught the newest and most shiniest upgrades, also they could take out the air to air avionics system as that would be rendered obsoulete against ikran. but they could replace it with some active EMF shileding making the ground targets be able to lock on. also they could find out some way to guide rockets into hitting their enemys.