...as well as two-letter and one-letter searches, which I still have to test.

The three-letter search, which I just tested, has improved tremendously in terms of both performance and accuracy. There are still some features that the beta search engine lacks when compared to the traditional search engine, but in some ways the traditional search engine does not compare to the latest version of the beta search engine. If those missing features were added to the beta search engine, as well as any new suggested features, the beta search engine will then be the most powerful, useful and usable search engine that FlyerTalk has ever had.

Please see the IB Search Beta Update thread for more details.

If and when the beta search engine is not in its test phases anymore, I intend to update this thread with how to use that search engine.