Whilst I can't answer what CO/NW are doing, I can answer what those codes are you see.

The C indicates the fare class is Closed. You will also see A for Available, and R or L for Waitlist.

Hope this helps.

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Latitudes.

For my part, I travel not to go anywhere, but to go. I travel for travel’s sake. The great affair is to move; to feel the needs and hitches of our life more nearly; to come down off this feather-bed of civilisation, and find the globe granite underfoot and strewn with cutting flints.
Robert Louis Stevenson (1850–1894)

[This message has been edited by Latitudes (edited 06-05-2003).]