Boeing shares were up slightly to $371.15.
The deal could be signed off as early as this week, Bloomberg said, citing people with knowledge of the matter. Discussions are still ongoing and the outcome may depend on whether the Dubai state-owned airline can reduce an existing firm order for Boeing's larger 777X jets.
In an interview on Tuesday with Bloomberg TV, Emirates President Tim Clark said the air carrier is considering the Boeing 787 order. Emirates had committed to buying 40 Dreamliners at the 2017 Dubai Air Show, but never finalized the agreement.
On Monday, Emirates said it ordered 50 Airbus A350 jets. The order's list price sits at $16 billion, according to CNBC, but a steep discount is typically negotiated by airlines.
The transaction was originally slated to see Emirates order 70 planes from the French manufacturer - 40 of the A350s and 30 A330-900neo jets - but all A330 orders were scrapped in favor of bringing the A350 order size to 50.
Boeing said Kazakhstan-based Air Astanta plans to purchase 30 of the 737 MAX 8 planes to service its low-cost airline FlyArystan. List prices for the jets suggest an order worth around $3.6 billion, although carriers will often negotiate discounts on bulk orders that reduce the total cost. Turkey's Sunexpress, another discount European carrier, said it ordered ten MAX 8 jets yesterday at a list price of $1.2 billion.
The new orders followed Boeing's estimate of a mid-December return to service for the grounded 737 MAX last week, which was taken from the air last spring following crashes in Ethiopia and Indonesia that killed 346 people, although Boeing commercial CEO Stan Deal told reporters Saturday that a firm return date was up to regulators at the Federal Aviation Administration.