Qantas Airways has increased its stake in Jetstar Japan, providing extra funds for the newly established low cost carrier.
Qantas and Japan Airlines, two of Jetstar Japan's joint venture partners, will equally share in about $120 million of new non-voting shares.
"The investment will increase Qantas and Japan Airlines' economic interest from 41.7 per cent each to 45.7 per cent each," Qantas said in a statement.
"The equity injection will support Jetstar Japan's future fleet and infrastructure growth."
Jetstar Japan began operating in July 2012, and currently has 18 aircraft flying to nine destinations.
Mitsubishi Corporation and Century Tokyo Leasing, the other joint venture partners, will reduce their share in Jetstar Japan from 8.3 per cent to 4.3 per cent.