In a large bowl, combine the ingredients for the buttermilk marinade.
Transfer the trimmed jackfruit to the marinade and let sit for 30 minutes, stir to cover all pieces.
While the jackfruit is marinating begin combining all ingredients for the breading mixture in a separate large bowl.
Once the jackfruit is done marinating, spoon out each of the pieces to a separate medium sized bowl, reserving the leftover liquid.
Transfer the leftover marinade liquid to a liquid measuring cup. In the same bowl that had the marinade liquid, add in ¾ cups of all-purpose flour. Slowly pour the marinade liquid back into the bowl with the flour while whisking to combine until you've created a pancake-like consistency.
Arrange your three bowls in the following order: jackfruit pieces (furthest from the air fryer basket), liquid batter, breading mixture (closest to the air fryer basket).
Use a spoon or tongs to dip the jackfruit pieces into the liquid batter, then gently press each piece into the breading mixture so that it's well coated on each side, then into the air fryer basket.
Spray both sides of each jackfruit piece generously with neutral oil of your choice.
Cook on air fryer setting at 400° for 20 minutes. Enjoy!