A whole bunch of transatlantic flights have recently been upgraded/switched to the M11s such as:
ATL-ZRH (started January 1, 2002)
JFK-CDG (started Nov 1, 2001)
ATL-CDG (started Nov 1, 2001)
ATL-AMS (can't remember when that started)
The reason supposedly has to do with pilot contracts and the hours they are guaranteed (according to someone I know at DL) because post-9/11, a whole slew of M11 routes were dropped (JFK-NRT, JFK-CAI-DXB, JFK-TLV, LAX-NRT, LAX-NGO) and DL had to redeploy those M11s....ATL-ZRH went M11 in January after one of the LAX-Japan flights were dropped...