Again you can charter one way as long as you pay for the round trip.
What makes you think this company has a 747. They are offering charters on Gulfstream IV's and the like
they gave "one-way" as a chartering option:
http://www.jetcharter.com/quotes/process.html I'm sure that they can find a few people to return... That will be factored into the total cost. Maybe under $400,000?
Also, here is where many of the sites had the "Large Jet" option. BTW -- Sruli was already looking into the charter -- he was just asking the date. IMO, one of the smartest dates are Aug. 26, 27, Pic: