This is correct, UA check in is all at T1. If you're elite, use the Permier Access line next to premier access check in, turn left and follow the signs for T2. Elite or not, you can use security all the way at the left end of the terminal (if facing check in desks), then turn left towards T2 after clearing (T1 is right). I haven't originated in ORD for a while, so maybe things have changed, however, I've found this security point is always way less busy then the main security checkpoint, and even sometimes less crowded then the main elite security line sometimes.