Combine maple syrup, soy sauce, sriracha and garlic in a small bowl, pour into a gallon sized resealable bag and add the salmon.
Marinate 15 to 20 minutes, turning once in a while. If you don't have time, 5 minutes will still be enough.
Lightly spray the basket with oil spray to prevent sticking or use air fryer parchment.
Remove the fish from the marinade, reserving and pat dry with paper towels.
Place the fish in the air fryer, in batches, air fry 400F 7 to 8 minutes, or longer depending on thickness of the salmon.
Meanwhile, pour the marinade in a small saucepan and bring to a simmer over medium-low heat and reduce until it thickens into a glaze, 1 to 2 minutes, careful not to dry it out. Spoon over salmon just before eating.
Spray the basket with a propellant-free oil or use air fryer parchment to prevent the skin from sticking to the basket.
There's no need to pre-heat to air fryer.
Don't overcrowd the basket so you get decent air flow.
There is no need to flip the salmon, it will cook on both sides fine.
To know if salmon is ready, the fish will change from translucent (red or raw) to opaque (pink) as it cooks. Check for doneness after 6 to 8 minutes of cooking, by peeking into the thickest part with a sharp knife or fork. It should flake, but still has a little translucency in the center when it's done.