gruezi dancyn4 (gruezi = Hi in swiss german): [*]the airlines (their ff-programsI don't allow it.[*]to my knowledge (I know more about UA and LH than about DL and AA), there are technical obstacles too: I don't know how to transfer Delta and/or AA miles into each other traders' account too[*]There might be a technical way to 'gift'/'trade'/'barter' awards (bought with miles) to each other.

such requests/questions/discussions are better placed under the The Coupon Connection forum.