Originally Posted by rickair7777

You're wrong. Many airlines have this. Normally it serves to prevent rare combinations where the personalities involved just don't mix well...like a marine major who bid avoids a hippy wannabe who rants about politics.

Occasionally it serves to help management identify CAs who need some help...If several hundred FOs bid avoid someone, and tell their buddies to bid avoid her then maybe there really is an issue.

But FOs have an incentive to use the tool sparingly...otherwise their QOL sucks because they can't get the pairings they want.