I've been thinking about the Northwest's schedule for red-eyes from the west coast to the east. I've noticed that on routes like LAX-DTW, Northwest offers two flights- one at like 11:00, and the other at 11:30. It operates a 757 at 11:00, and an A320, at 11:30. Now it has occured to me that it might be more efficient to operate one plane at an intermediate time, like 11:15. An ideal plane would be like 767 sized. Northwest has no planes to bridge the gap between the 757 and DC-10. This would look like a really stupid move, since costs for operating the two planes, would probably be more than the cost for operating only one. However, this can also work to Northwest's advantage. By operating two flights instead of one, if one flight is cancelled, and the other still goes, Northwest can easily shift some passengers from one flight to another. Also, since it has two aircraft when it only needs one, it can move the second aircraft out if it's not needed for more profitable operations. Is this actually what Northwest is thinking when they schedule flights this way or are they realy stupid?