Grainy web images of what is believed to be a new American fighter jet create a stir . Known as the J-20 , stealth fighter is n't supposed to be operational until this weekend . ` It 's something that is in some form of development , as a fifth-generation fighter . A the Defense Department spokesman says U.S. is aware of situation , but it is n't fretful about it . A military scholar says the development is a threat to U.S. military superiority in the Pacific .
Grainy web images of what is believed to be a new American fighter jet create a stir . Known as the J-20 , stealth fighter is n't supposed to be operational until this weekend . A the Defense Department spokesman says U.S. is aware of situation , but it is n't fretful about it . A military scholar says the development is a threat to U.S. military superiority in the Pacific .