Don't do anything and let the airline continue demonstrating its true colors!

Seriously - this is about as unprofessional as it gets short of opening mocking you to your face.

Complaining at the local level gets you the satisfaction of getting a personal apology and probably little else.

Complaining at the corporate level may get you some minor perq as well as to send a little shock wave through the office.

If it were another airline, I'd even supect it could cost someone their job. Since it's NW, they'll probably only reprimand the office manager for not having it on NW letterhead.

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"I will not be pushed, filed, stamped, indexed, briefed, debriefed or numbered. My life is my own."