Actually Reki was the only haibane that we are almost certain had killed herself in her former life (since she was the only one of the bunch who was born with black wings. I mean we all know that in Christian tradition, suicide is considered a major sin, hence the dark wings)... Rakka might of done the same as well but we're not so sure.
The 'Haibane Renmei' is the order or union that looks after the haibane, or the not-quite-human people that live in that human city (although the word 'haibane', according to the kanji used, literally means 'ash wings')... Also, about where they had gone or become after they're flight, that mainly depends on the viewer I guess. Your theory might be influenced by your religious faith as well. In other words, you may believe they had either gone to heaven or were reincarnated. Personally, I lean towards the 'reincarnation' theory ^_^
The 'Haibane Renmei' is the order or union that looks after the haibane, or the not-quite-human people that live in that human city (although the word 'haibane', according to the kanji used, literally means 'ash wings')... Also, about where they had gone or become after they're flight, that mainly depends on the viewer I guess. Your theory might be influenced by your religious faith as well. In other words, you may believe they had either gone to heaven or were reincarnated. Personally, I lean towards the 'reincarnation' theory ^_^
![[Image: --pkjdsAnimeNewsLog--.gif]](http://feeds.feedburner.com/--pkjdsAnimeNewsLog--.gif)