As the one in my gaming group with the most DS kills, nobody should ever be that desperate. In atmosphere, a DS is doomed, even against conventional aero, because they will be outmaneuvered.
In space, all aero has to do is concentrate attacks from the same direction to concentrate damage, a DS will die, even though it has a higher chance of survival in space. Moreover, if aero doesn't care about casualties, be ready to lose a DS.
As a GM, I've had players buy Mules and max out the armor to make them practically warships, but they aren't even close to stock models.
Price of Union: Just over 200 million; Med Aero Lucifer: Just over 3 million... So, it's much cheaper to lose 50 Lucifers...and you'd have a far better air superiority with 50 Lucifers...