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The simulation of model 2 considering the varying levels of the control parameter u and the time effect of the decision to shut down the airport. The rest of the parameter values used for the simulation are β = 0.7, γ1 = 0.24, γ2 = 0.05, μ = 0.02, σ = 1/4, δ = 0.025/3, λ = 0.000205, k1 = 0.6, and k2 = 0.4 [13, 16, 18, 19].
