Coarsely mash potatoes and salmon with a fork until combined.
Fold in bread crumbs, parsley, garlic, bell pepper and egg. Season with salt and pepper.
Form salmon mixture into 8 patties, each 1-inch-thick.
Spray crisper tray with olive oil cooking spray and place patties into the air fryer.
Set temperature to 350°F/180°C then press Start/Stop and cook for 12 to 15 minutes, until patties are golden-brown, flipping halfway though. Repeat with remaining patties.
Meanwhile, combine mayonnaise, dill, capers, garlic and lemon juice in a small bowl.
Serve salmon cakes with dill aioli.
Tip: Serve salmon patties with a spinach salad for a light lunch or dinner!