931 ORD-LHR DELAYED 4 hours plus. 6:20 now 10:30. Listed as mechanical. Oddly, the inbound is showing on time and in flight, so must not be bad enough to not continue inbound flight.

I missed a bullet, I'm on the 3:50 and tried to switch to have more time at a holiday BBQ. Glad now that it didn't go through!!