I wonder if the availability tool (iPhone 4 running iOS6) only returns a limited number of results for a given day:

For example, searching Oct 5 for DL with the "via" flight blank

LAX to MSP does not show the 00:50 nonstop

and

ATL-LAX only slows flights departing up to 12:00 (no afternoon flights)

Also, is there any entry for "via" that will show only nonstop flights?

(None of this is an issue with the normal tool)