Coat the air fryer basket with nonstick spray and preheat according to your model if required.
If wings are whole, trim off and discard the tips, then separate each wing into flat and drumette at the joint; pat all wings dry with paper towels.
Season the wings all over with 1 teaspoon kosher salt.
Arrange wings in a single layer in the air fryer basket without touching; stand drumettes on edge along the sides if needed.
Set the air fryer to 360°F and cook wings for 12 minutes; remove the basket and flip wings with tongs, then return and cook another 12 minutes at 360°F.
Slide out the basket, flip the wings again, increase the temperature to 390°F, and cook for 6 minutes, flipping once halfway; cook a few extra minutes if wings are large and not crisp.
While the wings cook, combine 2 tbsp soy sauce, 2 tbsp maple syrup, 1 tbsp rice vinegar, 1 tbsp minced garlic, 2 tsp minced ginger, and 1/2 tbsp gochujang in a medium saucepan; bring to a simmer over medium-high heat and cook, whisking, until slightly reduced, about 1 minute.
Remove the sauce from heat and stir in 2 tsp sesame oil, then transfer to a large bowl.
When wings are done, add them to the bowl with the sauce and toss with tongs until evenly coated.
Transfer wings to a serving platter and sprinkle with chopped green onions and sesame seeds; serve hot.