I figure the planes are Kabalite (I don't really see why Cults would need supersonic jetfighters), but since they obviously want the best possible pilots, they recruit ex-Reavers to fly them.
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Tougher than wet kittens, with armour stonger than the dampest cardboard, we are coming for you!
Kabal of Drowned Hope/Cult of the Fatal Kiss/Dark Labyrinth Coven.