Apologies in advance for asking a question that I could probably have answered with a search. But I am working with limited internet access, so would greatly appreciate your help.

The United website says that check in desks at BRU are open 3 hours before the flight, and that there are also check in kiosks. It goes on to say;

Please note that our flights have individual security screenings so therefore all passengers checked-in online or using our EasyCheck-In kiosks would need to present themselves to our security staff at check-in.

Does this mean that even if I am able to check in at the kiosk I won,t be able to go through security till 3 hours before flight departure ? I am specifically interested in UA973 to ORD.

Thanks very much .