Senior IAS officer Bansal took over the reins of the disinvestment-bound national carrier in August.
An order in this regard was issued on Thursday.
He was initially appointed for a period of three months.
Bansal, who is also additional secretary and financial adviser at the petroleum ministry, is a 1988-batch IAS officer of the Nagaland cadre. He hails from Haryana.
The extension of his tenure comes at a time when the government is in the process of finalising the modalities for the strategic disinvestment of the flagship airline.