Pat the cod as dry as you can with a paper towel and season well w/salt. Place the flour in a large, rimmed plate and beaten eggs into a bowl. Place panko, dill, onion powder, dry mustard, paprika & lemon zest onto a large rimmed plate and mix well
Coat the cod pieces in the flour and then right into the egg mixture. Then place it into the panko. Using your other (dry) hand, coat the fish in the panko all over evenly and place into the air fryer basket.
Spray the tops with cooking spray and cook until golden brown, about 10 minutes. Gently flip and cook another 8-10 minutes. If the underside of your fish has lost some crisp, you can flip it again and cook another 2-3 minutes.