It may be somthing to do with V Australia because apparently Northwest are having some sort of codeshare with V Australia. Im not sure why they would need 2 747's to come in though.
To add to the weird arrivals, 01-0041 (cn 33080/1089), a Boeing C-40B BBJ (737-7CP) from the US Air Force arrived just after 5 pm.
From 16Right.com
01-0041 MC2323 05/04/2008 17:01 USAF / USN --------->
http://www.airliners.net/photo/USA--...BBJ/1024085/M/
Tim