<p>Flat spin recovery is a critical aspect of aircraft flight dynamics, requiring effective control strategies to minimize altitude loss and stabilize the aircraft. This study investigates the impact of altitude margin and aileron usage on flat spin recovery. Flight simulations are conducted to analyze aircraft response when recovery is initiated at different altitudes evaluating the related altitude loss. The results indicate that higher initial altitudes result in greater altitude loss, emphasizing the importance of prompt recovery initiation. In addition, the role of aileron input in flat spin recovery is evaluated by comparing cases where ailerons are used and not used. The findings reveal that avoiding aileron input leads to safe recovery. The mathematical proof for not using the aileron for effective flat spin recovery has also been shown. The study highlights the rudder and elevator inputs are main in flat spin recovery. An incremental nonlinear dynamic inversion-based control law is employed for the spin recovery. Flight simulations using F-18 High Alpha Research Vehicle, together with Monte Carlo analysis under parametric uncertainties, demonstrate safe and robust flat spin recovery.</p>