Got it:
United Airlines 4425
(Operated by Mexicana De Aviacion)
Boeing 757-200
1:15 pm Los Angeles (LAX)
6:45 pm Mexico City (MEX) Non-stop
1553 miles
Lufthansa 499
Boeing 747
8:35 pm Mexico City (MEX)
2:25 pm (Next day) Frankfurt (FRA) Non-stop
5943 miles
This was actually quite a bit of a challenge. If you want to hop around and take a lot of extra time, it's easy. But this seems to do the trick by only adding one stop for you. Good thing Mexicana is part of Star Alliance.
Let me know what you think.
[This message has been edited by channa (edited 10-03-2002).]