Board Thread:General Discussion/@comment-25142096-20140908173232/@comment-1824272-20141001212018

See the calendar on the Main Page and see the Collaboration Event article. ALL Area 88 aircraft, except the F-20A -Shin Kazama-, will be Limited-Time Drops from October 3 to October 14 during the Ranking Tournament.

tl;dr Area 88 is less than half the month. There should still be another monthly drop.