Was not sure what section to post this so I figured I'd start here.

I will be making a trip from IAH to PWM via ORD in Nov and will be using AA for the IAH-ORD leg and UA on the other part. (long story as to why 2 diff airlines are being used). But my question is will I have to exit and do the whole security thing again or can I just stay on the airside and make the hike between terminals?