Pat the salmon fillets dry with paper towels.
Mix the brown sugar, smoked paprika, garlic powder, onion powder, thyme, salt, and black pepper in a small bowl.
Place each salmon fillet on a piece of aluminum foil and brush lightly with olive oil.
Sprinkle the brown sugar seasoning evenly over the salmon.
Fold the foil up around the salmon, leaving the top open or loosely tented.
Place the foil packets in the air fryer.
Air fry at 400°F, beginning to check the salmon at about 8 minutes.
Continue cooking until the thickest part reaches 145°F and the salmon flakes easily with a fork.