Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT Executive, AA, BA, SK, DL, NT, WB + hotels
Posts: 10,283
Yes, you can sell it. I wouldn't call Finnair and tell them about it, though. They might forbid the sales in their fine print.
I have bought electronic gift certificates off huuto.net, a Finnish equivalent to Ebay, a couple of times. No problems using them.