It's not as easy now, but there are places.
Direct internet sites to try:-
http://flyaow.com/classual.htm (This one calls the UA site, so you will always get UA flights along with others. The interface allows you to select far more airlines to display than the UA site itself allows, so it's a little bit of a hack, really.)
http://flyaow.com/classamex.htm (This provides a similar display through the AMEX site, but ultimately the data is supplied by the same GDS.)
Or you could go to
this page and download a small tool from there. The web interface that the tool calls is a travel agent's website in Germany (so gives German market availability), and has apparently been developed by one of the IT people working there. To reduce the traffic on the website, the tool works for 2 hours in every seven (ie it's up for 2 hours and down for 5 hours in a cycle).
To check its legitimacy, have a look at
this thead from "another BB" which also has lots of hints as to how to use it. There is another tool which is also mentioned in that long thread, but I've never tried it.