The airline, which is making efforts to turn around its fortunes, is expected to start inducting the three new aircraft in early 2018.
Currently, the carrier has 15 Boeing 777s in its fleet -- 12 of them B777-300ERs and the rest B777-200LRs.
A senior official said the carrier will take loan to the tune of USD 155 million from Deutsche Bank at a "very competitive" interest rate towards making pre-delivery payment for three Boeing 777 planes.
In December last year, Air India had sought proposals from banks and financial institutions for loan towards pre-delivery payment requirements for three Boeing 777-300 ER aircraft.
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Under the terms of the agreement signed with Boeing Company, Air India has to pay 15 per cent of the gross cost of the aircraft as advance payment 24 months prior to delivery.
Earlier, the carrier had sought deferment of the delivery of the three Boeing 777-300ER planes, which are part of its 68-aircraft order placed with the US aircraft-maker in 2006.
Following the downturn in the global aviation sector, the delivery of three B777-300ERs was postponed in 2008 as there was no "cancellation" clause in the original purchase agreement with Boeing Company.
Then in September 2015, Air India decided to take delivery of the remaining three planes as per the 2006 purchase agreement while rejecting a proposal, made by Boeing, to convert them into single-aisle planes.