Boeing and McDonnell Douglas, who have since merged, booked 877 net orders that year.
The aerospace company said in a statement yesterday that it may win additional orders before the end of the year. That would push its total over the 1988 figure.
The net order number represents the total number of passenger planes the company has sold minus any canceled orders. Boeing has won 895 total airplane orders so far this year, but 25 airplane orders were canceled.
The banner year represents a significant rebound for Boeing, which had recently been losing ground to rival Airbus S-A-S.