excuse my terrible English.
the same thing happened to me. after installing some local areas and rebuilding plan-g dbase, many airports are not anymore 'readable'
I found how to.  I hope is of your help.
Just set on all countries and click clear then try to search again your airport. it will be visible this time.
(info : I experienced this using plan-g_202 running on win7 64)

ciao

take care