That's all fine and dandy for the 75% of flights in and out of an airport, say LHR, that are domestic flagged carriers or governed by the FAA or CAA.
How about the other 25% that are foreign and have no restriction's on jumpseat visitor's?
Is it not a requirement for foreign flagged carriers to comply with a set of maintenance requirements before the CAA allows them flight into UK airspace?
Why not jumpseat restrictions? I am sure it is as much of a threat, post 9/11, than faulty maintenance work always has been.