Fast-growing Gulf carrier Etihad Airways says it is buying 10 more of Boeing's new 787-9 planes, making it the largest customer for that version of the aircraft.
Etihad said on Monday it is also ordering two Boeing 777 cargo planes.
The Gulf carrier and Chicago-based Boeing say the deal is worth a combined US$2.8 billion at list prices, though customers typically negotiate discounts.
Etihad is bankrolled by the oil-rich government of Abu Dhabi, the capital and largest of the United Arab Emirates.
Along with Dubai's Emirates and Qatar Airways, it is increasingly challenging more established airlines on long-haul international routes.