I am flying from EWR via ORD to LHR in business, first leg AA, connection to BA.

I am BA GGL. (Top tier)

I have a knee issue, but really don't like a wheelchair... Will I have to exit security to connect from the domestic leg in terminal 3 to the international leg, at terminal 5?

Am I better off taking a wheelchair? Or perhaps for the short layover AA special services will help me based on status?

15:29 landing in ORD
17:08 takeoff to LHR

​​​​ so about an hour and a half layover- on the same ticket... All insight and advice much appreciated.

Thank you!