When you load an 747 Classic (or 400F/-8F) with 106,000-140,000 Kgs of payload and charge per Kilo then you begin to understand why PAX hauling is a money loser.
Also what PAX hauler can stack the people 10' high and cram them into organized containers eliminating wasted money making volume?
http://www.boeing.com/news/feature/p...7_7478_pas.pdf
DB