NEW YORK -- Private equity firm TPG Inc. could invest in troubled Japan Airlines Corp. along with American Airlines parent AMR Corp. , according to an AMR executive on Wednesday and reported by Dow Jones. The move could potentially strengthen AMR's effort to secure a more robust relationship with JAL, and at the expense of Delta Air Lines , the news service reported. But it was unclear whether TPG would participate in a joint minority investment with AMR, or act on its own. JAL is undergoing a government-led restructuring and AMR and Delta are dangling equity stakes worth hundreds of millions of dollars as an incentive to deepen ties with the Tokyo-based carrier.

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