The sources said on Thursday that the Trump administration aims to send formal notifications for the deal in the coming days to Congress which can choose to pass legislation to block the sale.
Reuters reported last month that Washington and Abu Dhabi hope to have an initial deal on the F-35s by UAE National Day celebrated on December 2.
The US Senate Foreign Relations and House of Representatives Foreign Affairs committees have the right to review, and block, weapons sales under an informal review process.
The Trump administration has been working to advance Abu Dhabi’s longstanding request to buy F-35s after the UAE and Israel signed a normalization agreement at the White House in August.
Israel initially tried to stop the prospective sale but last week ended its opposition after getting so-called US guarantees that Israeli military superiority would be preserved.