Aviation

System 1. Lift

 Lift - Lift is the system that allows the aircraft to gain altitude when in flight. Most aircraft use flaps and elevators to help gain altitude. But mostly the wings generate the lift and the elevator and flaps help gain altitude. The aircraft's airflow system is what allows the plane to lift when air travels smoothly over the Wings and Elevator. 

System 2. Weight

Weight - Gravity is always trying to push the plane down so by using lift and thrust

the aircraft can push against gravity allowing the aircraft to stay in the air.

System 3. Thrust 

Thrust - Thrust is what allows the aircraft to take off, fly, and land.

Using Thrust, the engines of the aircraft use the thrust to generate push and allow air to travel over which generates lift.

System 4. Drag

Drag - Drag is what keeps the aircraft's limits to speed. If an aircraft is experiencing drag it will slow down the aircraft's speed. If molecules build up on the surface of the airplane, it causes friction slowing the plane down.

Conclusion

The four airplane systems of flight conclude how a plane goes through a daily life of travel. In situations where this information is needed, perhaps in flight school, there are other systems of the airplane that are important, but the 4 principles of flight are the lead show in aviation!