No, there is no direct access from the terminal to the cargo facility. Taxi or Uber will be best bet, or perhaps just rent a car, drive to the facility, get your cat, and then drive back to airport and return rental car and continue your trip to BOS. There is parking at cargo area.
To get to cargo area, as you exit the airport, get on Mannheim Rd South exit proceed towards Irving Park Rd (should be the second light), turn right (go west) Third light is entrance to cargo facilities, make another right at the light and just follow the road towards United.
As for UA cargo answering the phone, its best to call them at their 800 #, and still you wont get a straight answer. I work with a freight company in ORD and I'm very familiar with this. Good luck.
Last edited by arollins; Aug 12, 2018 at 7:32 pm