SF,
It isn't quite as easy as it seems. Jumpseats are very restrictive these days, in the USA, as Intruder says, the Feds have clamped right down & here in Europe, while not quite so restrictive, you have, generally, to have a business reason for travel and the required approvals from the company.
Unfortunately the good old days of hopping on a company aircraft for a few days vacation are long gone!
RT