Japan Airlines Co., which exited bankruptcy last year, is planning an IPO that could net as much as 1 trillion yen ($13 billion USD) as early as September, according to two sources familiar with the matter.The government-backed fund that holds 97% of JAL’s voting rights and other investors are considering selling 500 billion yen to 1 trillion yen of shares, the sources indicated to Bloomberg.JAL’s spokesman declined to comment.