Would it be possible to reduce the minimum search term length to two (2) characters instead of the current four (4)? The reason for this is that the majority of my searches include either a three character airport code or a two character airline code... neither of which is included in the search. Surely the additional load on the search DB table wouldn't be unbearable.

A good example of this is searching the "Mileage Run Deals" forum for 'UA' (as in, all MRs on United), results in:
The search term you specified (UA) is under the minimum word length (4).

or 'LAX' (as in, all MRs to/from LAX), results in:
The search term you specified (LAX) is under the minimum word length (4).

I think lowering this to a two char minimum would also help a lot of posters in finding identical posts and would reduce the duplicates.