you make sure while checking in the luggage in chicago airport that you tell them the whole story, not just a part. tell them what are they going to do while they reach delhi. It is going to be their full responsibility to take them to the right place with their luggage. when you tell them they put note on the ticket as well as on their system about all your story. but still if your parents can check once their luggage in delhi,,its helpful. in my parents case they didnt even see their luggage until they reached to ktm airport. I carefully instructed the person in chicago AA counter what is need to be done, where their luggage is going to be, where is their final destination, what airlines are they going to take next, what is the next flight schedule and everything. If you dont give them a complete information, they are not going to assume your travel itiniary....and they are not going to look after your belongings.....you make sure you tell them the full story with little polite so that they do thier job. read the airline policy carefully,,its their responsibility to help a handicapped for the whole entire travel.