Boeing's August 737 deliveries, announced on Tuesday, were an improvement from the 29 delivered in July, which was one of its lowest monthly tallies in years, due to ongoing supplier delays that caused unfinished aircraft to pile up at its Renton, Washington plant.
The world's biggest planemaker said it was making "good progress" towards fixing the logjam by year end.
Boeing also said its 2018 net orders totalled 581 aircraft through August, up from 487 towards the end of July. That includes 90 orders in August for 737 variants from leasing firms and unidentified customers.
Industry sources said many of those orders confirmed business unveiled at the Farnborough Airshow in July.
Airbus has been slower to confirm such orders than in the previous two years when most air show business had been formalised by the end of August. Airbus this week posted 219 net orders for January to August, including five in August.
It had announced firm orders for 145 aircraft at Farnborough, including some in its books before the event took place, leaving around 90 orders still to reach its books.
Airbus said some orders were in the process of being audited and warned against reading too much into the pace of bookings.
"One month is not representative of the entire year, especially August," a spokesman said, referring to the summer slowdown in European business.
But the gap raised fresh questions over a landmark order for 34 extra A330neo wide-body aircraft from Air Asia.
In July, Airbus called that deal "firm," which observers say usually means approvals have been received and deposits paid. But two industry sources said details had yet to be resolved.
Air Asia was not available to comment. Airbus declined to comment on individual deals.