def add_flight(routes, index):
route = routes[index]
if len(route.flights()[-1].connections) == 0:
return routes
if len(route.flights()[-1].connections) > 1:
for connection in route.flights()[-1].connections[1:]:
new = Route(route.flights()[0])
for flight in route.flights()[1:]:
new.add_route(flight)
new.add_route(connection)
routes.append(new)
route.add_route(route.flights()[-1].connections[0])
add_flight(routes, index)
return routes
