To those saying that a flow screws DGI guys, some points to consider:

Rejecting a flow would not in any way guarantee continuation of the DGI, nor would accepting it automatically make the DGI go away. It seems to me that if we turned down the flow Delta might cancel the DGI just to teach us a lesson, and then we're left with nothing. Also, since the DGI is outside the contract, Delta could continue it at their discretion even if we do accept the flow.