This is just my guess, as I am no business expert or even know a whole lot about it at all, but all of these MD-11/777 switches to 763s could be a good thing for Delta. Maybe it will help them to get a higher load factor (bigger plane to smaller plane, thus higher load factor) on longhaul international services, thus making the airline more profitable. Anyway, that might be totally wrong, but it seems logical to me. I have been following some of these flights for quite some time because my mom, my brother, and I are scheduled to fly from ATL to FCO and then back from MXP to ATL on DL in July. We booked the first day we could because we needed to book frequent flyer seats. The booking was on August 21. ATL-FCO started as an MD-11. It then changed to a 763. It has now changed to a 777 (I love flying 777s!). MXP-ATL was a 763 when we booked. It then changed to a 777. It then switched back to a 763. The times for that flight have changed numerous times though. Right now, I'm really happy with the planes on those routes. 777s are a lot of fun to fly on and in my opinion, Delta's are very comfortable in economy. I am also happy with the 763. I have been fortunate enough to get to go to Europe three times, but in all of those six transatlantic flights, I have never once been on the most common transatlantic plane, the 767. Two of those flights were on MD-11s (ATL-BRU, BRU-ATL), two were on A330-200s (ATL-ZRH, ZRH-ATL) and two were on 777s (ATL-LGW, CDG-ATL).