Originally Posted by
Peoriaman1
The System can't tell if I'm headed back right away on the red eye LAX-NYC on United....

True.
But what is difficult to do is land in LAX late afternoon with SWA. Then fly to NYC on a red eye landing early the next morning. And then jump back on a place with SWA that same day. All very possible of course, but a bit crazy even for us that have done milage runs.