Boeing and Biman Bangladesh Airlines signed a deal for two 787-9s aircraft, which list at $292.5 million apiece.
The deal was signed during the Dubai Airshow 2019.
Biman already has in its fleet four 787-8s of the US plane maker and the new planes would be 20 feet longer.
Prime Minister Sheikh Hasina yesterday joined the opening ceremony of the airshow, one of the largest aviation exhibitions in the world, and enjoyed a flying display.
The five-day airshow would continue until November 21 at the Dubai World Central (DWC) with the participation of some 1,300 companies from 160 countries.
Hasina joined at the invitation of Vice President and Prime Minister of UAE, and Ruler of Dubai Sheikh Mohammed bin Rashid Al Maktoum.
On her arrival at the venue, she was received by Sheikh Mohammed bin Rashid Al Maktoum, also the UAE defence minister.
Later, she attended dinner hosted by Bangladesh Ambassador to the UAE in her honour.
Hasina reached Dubai on Saturday night on a four-day official visit.
The Dubai Airshow, launched in 1989, has turned as a global platform for the aviation industry to sell its new wares, as the public and private sectors meet to discuss new technologies, opportunities, and hurdles facing the industry.
In 2017, the last aviation exhibition drew 79,380 trade visitors from around the world, which featured 1,200 exhibitors from 63 countries and an order book in excess of $113.8 billion.