DocJcko,
Last time I was in FRA (at the top of the viewing tower), they were taking off towards the city, so you'd want to be on the left.
Akerosid, are you referring to the airport observed from the top of Sugarloaf mountain (as seen in Moonraker)?
AFAIK, that's Santos Dumont (SDU), so you'd need to be on a domestic flight - most flights from the UK go to Sao Paulo first, so a t'fer shouldn't be too difficult?
flyerz111, any seat in the cockpit would do, but I don't see that happening for us lowly passengers any time soon, unless you know any (legitimate) ways?