The Foreign Policy Magazine reported that two senior US defense officials with direct knowledge of the situation informed it that American personnel recently counted Islamabad's F-16s and found none of the planes missing.
The US State Department has said that America is seeking more information from Pakistan on the potential misuse of American-made F-16 fighter jets by it against India in violation of the end-user agreement.
The aircraft must be built largely in India as part of Prime Minister Narendra Modi's drive to build a domestic industrial base. The air force said in a notice that "85 percent will have to be made in India by a Strategic Partner/Indian Production Agency".
Pakistan, which expected to get the fighters at the subsidised rate of $270 million, was subsequently asked by the US administration to make the full payment for the eight aircraft from its national resources.
Quoting an unnamed official in administration, a BBC report said that the because of the hold on it by Senators in the Senate, the US Government will not be using any of the tax payers money to sell F-18 to Pakistan.