The great circle distances for the routes mentioned so far:
DXB-JFK 5967 nm
MEM-HKG 7115 nm
EWR-SIN 8285 nm
DXB-LAX 7246 nm
LAX-MEL 6883 nm
DFW-BNE 7215 nm
LHR-SYD 9188 nm
BOM-EWR 6784 nm
http://www.gcmap.com/map?P=OMAA-KJFK...X=720x360&PM=*
(Courtesy of the wonderful
Great Circle Mapper )