The HDD of my previous PC was crashed, so I could only copy as many files out of the broken hdd as possible. The transfer of iTunes did not go well, and some apps was lost. I just found airport mania was lost, so I tried to install the app again. And app store charged me AGAIN! I thought I should be able to re-download my previous purchased app without paying again!
plasmaball about Airport Mania: First Flight XP