Since news broke last week that Japan Airline Corp. is seeking a capital investment from a foreign airline, speculation has been rife over which one would make the best fit for the struggling carrier.

On Tuesday, JAL President Haruka Nishimatsu said the airline plans to ink a partnership agreement with either AMR Co.'s American Airlines or Delta Air Lines by mid-October.

Although no specifics of the negotiations have been disclosed, the pros and cons show there are risks in either deal.