I have a $25 off cert (off of published econ fare of $200 or more), that I received when I signed up for Bank One Mileage Visa card. This has my name on it, and
"This travel cert entitles the customer named hereon to a $25 discount towards the purchase of any United ....."

Can I give it to anyone else to use this cert. I wont it using it before expiration date"

The other one that I have is "One-Way Upgrade Within North America good for 1000 miles.....
Full Y or C class fare must be purchased. Premier members may use with any published fare".
Can anyone else use this one.