I was on this flight.

It was delayed because (according to the announcements) it was delivered late from the engineering facility and had to undergo security checks and "sanitising" before we could board.

By the time we got to PHL I had already been offloaded from my connection to LAX - they blamed BA for failing to confirm something or other - and I had lost my seat to an upgrade. But a heroic customer service agent got me back onto the flight, in Flagship, and all was well again.

Now in the air on my way to Hawaii.