It's a sorry state of affairs that people are getting windy about a few traffic jams and people stood about. This is truly the end of an era, there will be crowds, and there will be traffic. The powers that be should not be interfering with this and threatening to cancel the farewell.
Many many years ago when I pounded the beat, I was driving my jam butty along and I saw quite a gathering at the end of what was 24R at Manchester. I wound down my window and asked someone what was going on. I was told Concorde was coming in.
I parked up, moved a couple of cars on that had been parked stupidly and then just tried my best to keep everything moving without any issues.
I even managed to look skyward when the mighty Concorde arrived.
These things happen so rarely it should just be embraced.