Prepare the chicken wings by cutting off the wing tips and discarding (or freezing for chicken stock). Divide the drumettes from the wingettes by cutting through the joint. Place the chicken wing pieces in a large bowl. Drizzle a little olive oil and 1 teaspoon of sesame oil over the chicken wings and sprinkle the Chinese 5 spice powder on top. Toss to evenly coat the wings with the seasoning.
Combine the orange marmalade, soy sauce, ginger, hoisin sauce, sesame oil and red pepper flakes in a saucepan. Bring the mixture to a boil on the stovetop, lower the heat and simmer for 5 to 10 minutes, until sauce has thickened. Set the sauce aside and keep warm.
Air-fry the wings in two batches for 12 to 15 minutes per batch, shaking the basket half way through the cooking process. When both batches are done, toss all the wings with the orange sesame sauce and place the wings back into the basket for another 3 to 5 minutes to heat through and finish cooking.
Transfer the wings to a serving platter and sprinkle toasted sesame seed over top. Garnish with chopped scallions and serve. A squeeze of orange juice is really nice on these wings too!