Not quite true, Thunor. For example I believe ATC famil flights still happen. It would be a long-winded and possibly fruitless process for you, but I believe some airlines would provide under certain circumstances. You would need to approach each airline DFO separately but they will take some convincing!
You could always book a ticket with one of our European partners that do allow of course - if you believe what you see on PPRune
. I suspect you are going to be unlucky in the UK or US.
Try 'search' back into 2004 for 'jump seat' for a few pointers.