I'm searching for flights departing JFK on 11/3/11 for SYD, and am wondering why the research results differ depending on whether I'm searching for skyteam, DL/KE/AF.

Meaning, suppose the following:
A) search with airline 'DL' returns flights 1 2 3 4
B) search with airline 'KE' returns flights 5 6
C) search with airline 'AF' returns flights 8 9 10

But,
D) search with 'skyteam' returns only flights 1 2 3 4 5 7

Why is there this inconsistency? Thanks.