To make it simpler for those having trouble with this: The concept of a 'dress code' would apply to reservations and headquarters staff only since airport employees aren't given guidelines on what type of outfits are acceptable, but rather are required to wear uniforms. She was apparently out of uniform. Distastefully so, according to the OP. If it were just a bad dye job and bad makeup, I don't think that there would be any call to complain, but that's not the case here. When she's at work, she's representing Northwest airlines and as a front-line employee, is NW's face to the public.
OK - can we get back to this thread being funny now?
peace,
~Ben~