Boeing has slightly raised its 20-year forecast for new aircraft deliveries to 34,000 from last year's figure of 33,500.
It disclosed the prediction in its latest Current Market Outlook, covering the two decades to 2031.
Boeing says single-aisle aircraft will account for 23,240 deliveries while 7,950 will be twin-aisle types.
Its figure for large aircraft - such as the Boeing 747 and Airbus A380 - has contracted from 820 to 790.
Boeing estimates the overall value of the new deliveries at $4.5 trillion.
Of the 34,000 deliveries, some 59% - around 19,890 aircraft - will be for growth while the other 14,110 will be replacements. The retained fleet will amount to 5,780 aircraft.
Asia-Pacific remains the primary source of demand, with just over 12,000 deliveries expected for the region by 2031.
Europe and North America will take 7,760 and 7,290 aircraft respectively.