&44 ruel managment
Thank you Silberfuchs,
Now there is an answer that makes a ton, (well 10 tons actually), of sense.
On the 744 they are burning fuel from the center wing tank first in order to make enough room for the 22.000 lb from the tail. It is then transferred all in one "go". Whereas on the busses the fuel is carefully monitored and transferred as required in order to maintain optimum C of G throughout the flight.
Amazing, truly amazing!
VRT