New Delhi/Mumbai, Apr 8 (IANS): Global private equity firm TPG Capital and international airline such as Lufthansa are among six entities who are believed to have shown interest in the "expression of interest" stake sale process of the debt-ridden Jet Airways, sources said. The development comes as lenders of the debt-ridden airline invited EoI for stake sale in the airline to recover their dues worth Rs 8,000 crore. Sources said that TPG Capital, private equity firm KKR, Blackstone, Lufthansa, Singapore Airlines and Delta-Air France-KLM are among the companies approached by the lenders.