Pakistan International Airlines is the flag carrier of Pakistan with a diverse fleet (with respect to size and range). Your task as a certified OOD programmer is to develop a system using C++ language that can help PIA to manage their planes/routes. Each plane of PIA is considered as an asset and PIA store some information about its assets i.e. name, unique_id, date_of_purchase, value_while_purchased, and yearly_depreciation. Each plane have a unique_tail_id, seating_capacity, range, and license (national/international). The chief route manager of PIA is responsible to create routes (using create_route function) where each route has its own requirements i.e. plane_license, distance, passenger_demand. Before creating a route, route manager ensure that assigned plane for that route fulfill the route requirements. Once a national route is scheduled, no further approval is required. While for international routes approval from competent authority is required (which is not important tomention here)