Thanks for your response! I purchased the item for $3000.00, it was one of the top prizes Amex was giving away along with the $5000 Range Rover (I would have preferred that!).
Therefore I am responsible for taxes between the actual price of the item and what I paid ($33,000 minus $3000, as the item also included a $1000 giftcard that I'm not going to sell). That makes my actual cost about $12,600 ($3000 + (32% of $30,000)). Still a great deal, but I don't really have a use for it.
Here's the link to the contest info: http://www.mylifemycard.com/mywishlist/media/pdfs/skyjet.pdf
I did consider charity, but I'm not sure they'll have a good use for a private jet. Maybe in the silent auctions to raise money.