India, which rivals China as the world's biggest gold consumer, has witnessed a spike in smuggling after import duties were hiked three times this year to try to dampen demand for the precious metal.
The plane belonging to Jet Airways was being cleaned at Kolkata airport on Tuesday after a trip from the eastern city of Patna. It had previously been flying on international routes.
"The cleaning staff of the airport were going though their routine duties and found two bags in the toilets of the plane," director of the airport BP Mishra told AFP.
The one-kilogram gold bars "have not been claimed by anyone. No arrest has been made as yet".
Senior customs official R.S. Meena estimated the value of the haul at about 70 million rupees, or $1.1 million.
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All Pakistanis constantly ridiculing India for lack of toilets, please note that the toilets in India have gold.