Originally Posted by
freed0m
Likely routing issue.
ORD-HND/NRT-SIN
or
ORD-TPE-SIN
are preferred to European routes.
Thats what I was thinking as well and was trying to look for any routing rules with regards to Star Alliance awards but could not find any.
Another thing to note is that I noticed the same behavior with UA as well, wonder if both SQ and UA are adopting a preference/rule of TPAC routes only when going from NA to SEA.