Jumpseating on AA to London

[Smash312]

I was heading back to London Stansted on a regular basis out of JFK. First on Maxjet ($7 to London) and then on EOS ($2.50 to London). Both were class outfits and got me to London Stansted with no problems what so ever (they'll be missed by me for sure!) Now I know AA are the only other carrier going into STN and would like to know what an offline pilot like me would have to do to 'Jumpseat' across to STN from JFK. I know sitting in the cockpit is out of the question internationally - but are there any chances of getting a seat in the back WITHOUT doing a ID-90/ZED fare?

If anyone has a clue - please do help!

Thanks!