Butterfly the lobster tails with meat or kitchen shears.
Melt the garlic butter and mix in the cajun seasoning.
Brush the butter mixture on the lobster meat.
Add the lobster tails to the air fryer basket. Air fry at 390 degrees for about 4-5 minutes. You can add an additional minute or two for larger tails if they are not opaque.
Optional: Brush with additional garlic butter before serving.