3 years back I moved to Japan for work. I always wanted to bring my parents here but they cant speak English or Japanese. One way I can travel with them but other way I cannot go again as it becomes too expensive for me. Airport staff helps at one counter and leaves, they cant take care end to end. So many people travel same routes every day. If someone already on that flight helps my parents through checkin, immigration and boarding for small fee that solves everything. Every traveler carries passport so verification is already there. Same way we can also send urgent parcels or documents through trusted travelers on same route.