American Express Membership Rewards - Does Amex ever offer US Air transfer promos?

I know that DL and Amex offer transfer bonus promos to Membership Rewards members on a relatively frequent basis. Has there ever been a similar US promo?

Thanks!!

Right after 9/11 US had a 20% bonus for transfers, but I don't recall any since then or before then (DL seems to offer them all the time ...):

Thread on 20% Bonus (http://www.flyertalk.com/pasttalk/ftpasttalk_forum/Forum51/HTML/001724.html)

And I've seen CO more than once, I think.

And I've seen *Wood as well.

But don't know of any right now, which is too bad b/c I many MANY MANY MR points burning a hole in my proverbial pocket.

Just waiting for the right promo...