public class PlayerController : MonoBehaviour
{
    [SerializeField] float speed; // add value in the inspector (about 20)
    [SerializeField] float turnspeed; // add value in the inspector (about 50)
    float horizontalAxes;
    float verticalAxes;

    void Start()
    {
        
    }

    void Update()
    {
        horizontalAxes = Input.GetAxis("Horizontal");
        verticalAxes = Input.GetAxis("Vertical");
        //slides car to the sides
        //transform.Translate(horizontalAxes * Time.deltaTime * turnspeed * Vector3.right);
        //rotates car
        transform.Rotate(Vector3.up, horizontalAxes * Time.deltaTime * turnspeed);
        transform.Translate(speed * Time.deltaTime * verticalAxes * Vector3.forward);
    }
}

Dodatkowo możemy dodać skrypt do kamery aby podążała za samochodem

public class FollowPlayer : MonoBehaviour
{
    [SerializeField] GameObject player;
    [SerializeField] Vector3 offset;
    void Start()
    {

    }

    void LateUpdate()
    {
        transform.position = player.transform.position + offset;
    }
}

Podstawowy ruch samolotu na wprost z rotacją góra dół

    float speed = 2f;
    float rotationSpeed = 80f;
    float verticalInput;

    void Start()
    {

    }

    void FixedUpdate()
    {
        verticalInput = Input.GetAxis("Vertical");
        transform.Translate(Vector3.forward * speed);
        transform.Rotate(Vector3.right * rotationSpeed * Time.deltaTime * verticalInput);
    }