protected $fillable = [
        'username', 'email', 'password'
    ];

$flight = AppFlight::create(Input:all);

or

$flight->fill(['name' => 'Flight 22']);

public function createUser(NewUserRequest $request, User $newUser)
    {

$newUser->insertUser($request);

}

public function insertUser($request)
    {
        $newUser = $this;
        $newUser->user_type = (int) $request->input('user_type');
        $newUser->username = $request->input('username');
        $newUser->email = $request->input('email');
        if ($request->filled('password')) {
            $newUser->password = bcrypt($request->input('password'));
        }
        if ($request->filled('facebook_id')) {
            $newUser->facebook_id = $request->input('facebook_id');
        }
        $newUser->save();

        return $newUser;
    }

Example::create($request->input());

protected $guarded = [];

Example::create($request->only('name', 'age'));

Example::create(['name' => $request->name, 'age' => $request->age]);