Working code example

void AddAircraft();
void ListAllAircraft();

FlightSystem aircraft;

int main() {

	AddAircraft();
	ListAllAircraft();

	return 0;
}

void AddAircraft() {

	aircraft.AddAircraft("FN 350", "Ryanair", "Plane", 500, 3000, "k7", 34);
	aircraft.AddAircraft("FL 890", "Ryanair", "Plane", 500, 3000, "k7", 34);
}

void ListAllAircraft() {

	for (int i = 0; i < aircraft.ListAllAircraft().size(); i++) {

		cout << aircraft.ListAllAircraft().at(i).GetAircraftType();
	}

}