Modified searching to allow for 3 letter airport id's in Plan and airport id's that start with K in Find.

modified searchOne (used in Plan) to allow the user to enter a 3 letter 
airport id which will be used if there is no 3 letter NAVAID (ex. 4K3)

modified search (used in Find) to return airports if the user enters at
least 3 characters and the first is a K.  (ex. KOJ will return KOJC and
well as the fix that also begins with KOJ).