An AoA vanes are fitted to lots of (most?) Public Transport aircraft. Their output is used for things like stall warning, windsheer prediction/protection, V2 calculation and other such stuff. It's greatest use would be AoA presentation for landing. This would allow approaches at any weight and configuration without having to do stupid sums to calcuate values to generate speeds which the AoA indicator would generate, without error, instantanously! However...