Boeing's total number of commercial aircraft orders received in 2019 dropped by 11 during October as at least one customer swapped orders for the 737 Max to the 787.
The company's net orders for the year slipped from 56 to 45 in the month, with Boeing logging 10 new aircraft orders but removing 21 orders from its books.
During October, the Chicago-based airframer delivered 20 commercial aircraft, down from 25 in September
Boeing's October order and delivery figures come as it continues working toward re-certification of 737 Max, which has been grounded since March.
Following the grounding, Boeing halted 737 Max deliveries, while orders for new aircraft have slowed.
The 10 aircraft orders Boeing logged in October included five 787-9s for lessor Air Lease, two 777Fs for Lufthansa Cargo and orders by unidentified customers for two 787-9s and a single 737 Max.
The Max order actually represents a delivery position swap between two customers, not an additional order, Boeing says.
Boeing moved 21 aircraft orders off its books in October, including 15 737 Max orders that lessor Air Lease converted to an order for five 787-9s. Air Lease had already announced that swap.
On 31 October, Boeing's backlog stood at 5,457 aircraft, including 4,387 737s, 18 747s, 102 767s, 428 777s and 522 787s.
The company's 20 aircraft deliveries in October included a single 737NG-based P-8A Poseidon surveillance aircraft to the US Navy, one 747-8F, three 767s, three 777s and 12 787s, Boeing says.
By comparison, Boeing delivered 57 aircraft in October 2018, prior to the grounding.