I take it that DL has no equivalent to United's "Global Services" status, which is invitation only and based on spend (or corporate contract, i.e.spend). Those cats rarely travel in coach domestically, even on el cheapo tickets. One exception is when a bunch of us peons buy -UP fares and fill up the front cabin (happens a lot on DEN-PIT, for example). My heart bleeds when I see one of those poor GS guys head back to Y.