Melbourne Airport 2005/2006
Pax movements: 4,390,000
International Aircraft Movements: 25,250
Thus pax load per movement = 173
Average aircraft capacity: assume 250 seats
Thus load factor = 69%
Movements per week = 485
250 seats x 485 movements = 121,250
121,250 x 31% = 37,587 empty seats per week
37,587 / 400 = 93 empty 747 movements
Add in the rest of the country and 200 empty 747 arrivals is probably a reasonable estimate.
Even if we assumed a 95% load factor, that's still 15 empty 747's at Melbourne alone.
Is that a better "factoid" than "chocka"?