Having flown through G concourse at Dulles I've decided its an experience I don't want to repeat. Is there any formula for which UX flights use G so one can avoid them?

On a related note, I was told by the relative of a UA employee that the UX operations at Dulles have apparently deteriorated so rapidly in the aftermath of the ACA departure that people from UA WHQ have allegedly been dispatched to troubleshoot. Certainly seems plausible given what I (and apparently other FT readers) have been through.