Originally Posted by ND Sol
Last year I used the companion certificate for a flight to YYC and the $ off certificate for a flight to CHS. Not really too many restrictions on their use (can't remember, but a Saturday night stay may have been required). A good investment especially with the 7,500 miles as well.
Also look at this
thread
Sorry... may be a stupid question... but can the companion ticket be used on CO/NW code shares?
Also, do you still recieve miles for the travel / are they still upgradable?