I managed to skip the entire line at Ohare security screening by just walking past people waiting patiently while I repeated "sorry, plane is boarding, excuse me, boarding, pardon me..." etc. Nobody bothered objecting and got out of the way for me.

My incoming flight was delayed, and immigration took forever, so once it was time to get to my connection the plane had started boarding. After security I had to run, and I got to the gate just in time.