When you reach the countryside, keep a distance from Morello's car. He will then pass the airport. Keep following him out to the bridge near the Lay-By. You will see that it is under construction. An intermission sequence where Tommy pushes Morello's car out over the bridge will start, and the mission will be completed. It is of course more fun to play the airport mission, but this is much faster.
To easily complete the mission, simply ride alongside Morello's limo. Sam and Paulie will shoot through the glass with their Tommy guns and kill Morello without having to enter the airport.
Once your car escapes into the countryside, the game is saved. Keep a certain distance with Morello's car. Make sure not to lose him. Keep your car's speed constant. If Morello's car does not collide with any oncoming car from the opposite side, it will not go to the airport, Instead, it goes up to a hilly road. Constantly follow him. After following Morello's car for a couple minutes, notice that it will reach a dead end. This dead end is a bridge that is under construction. A cinematic will start. It shows that after Morello's car gets stuck at the dead end, Tommy drives his car and crashes into it. As a result Morello's car topples down from a great height down to a road. He is dead and the mission ends.
In this mission the death of Morello generally takes place by shooting the airplane that he tries to escape on with a Thompson gun. However, you can do the following to kill Morello at no cost to your health without firing a single bullet. As soon as your car escapes into the countryside, the game is saved. Keep a certain distance with Morello's car and make sure not to lose him. Keep your car's speed constant. If Morello's car doesn't collide with any oncoming cars on the opposite side, it will pass the airport route. Instead it will goes up to a hilly road. Keep following him. After following Morello's car for a couple minutes it will reach a dead end, which is a bridge under construction. A cinematic will showsthat when Morello's car gets stuck in the dead end, Tommy crashes his into it. As a result, Morello's car topples down from a great height down to a road. He is now dead and the mission ends.