American International Group Inc. (NYSE: AIG) said Monday it is paying back nearly $4 billion in taxpayer aid. Its the single biggest repayment of government loans so far.

Repayment came shortly after the  International Lease Finance Corp., AIG’s aircraft leasing company,  sold $4.4 billion in debt to investors and payed back $3.9 billion to the  Federal Reserve Bank of New York, three years early with the majority of the earnings.That leaves the company left with $15 Billion in debt, or $21 Billion which includes interest. The money was a part of a $182 billion federal bailout package that AIG received to keep afloat. The company has been selling off its assets to begin repayment.

Robert Benmosche, AIG President and CEO said  “This is continuing tangible evidence of AIG’s progress in repaying the American taxpayers,” said . “AIG is getting stronger every day. We still have more work to do, but we will finish the job and make sure we repay the American taxpayers.”

The Federal Reserve Bank of New York, owns $25 billion worth of preferred interest in two of AIG.’s foreign life insurance units that must be monetized. The US Treasury owns another $49 billion of its preferred shares. AIG said it will set off an accelerated amortization pretax charge of about $650 million against its earnings due to the repayment.

Shares of AIG dropped 13 cents to $35.04.