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I think the BA blood lance psychic power is really good as flyers are around a lit:
So you cast passing most of the time then roll 4d6 averaging 18" with an automatic hit. It's strength 8 ap 1 so it has a good chance of blowing up the flyer. I think this is one of the most cheapest ways to take down flyers other then aegis defense lines or trying your luck on objectives to get skyfire. I'm not gonna try meltagunning a flyer for 6 turns

Can't weapons that autohit not inflict damage on flyers?

Yeah, it wont work if the flyer is zooming.

Q: How do maelstroms, novas and beams – or indeed any weapon
that doesn’t need to roll To Hit or hits automatically – interact with
Zooming Flyers and Swooping Flying Monstrous Creatures? (p13)

A: Only Snap Shots can hit Zooming Flyers and Swooping
Flying Monstrous Creatures. Therefore, any attacks that use
blast markers, templates, create a line of/area of effect or
otherwise don’t roll to hit cannot target them. This includes
weapons such as the Necron Doom Scythe’s death ray or the
Deathstrike missile of the Imperial Guard, and psychic
powers that follow the rule for maelstroms, beams, and
novas.

Blood lance is kinda meh. It's better to go for divination powers usually. Giving a whole ASM squad 4++ saves makes them pretty good again.