Driven by strong order inflows, Boeing's commercial airplane backlog rose from 4,373 undelivered aircraft at the beginning of 2013 to 4,777 undelivered aircraft at the end of the third quarter. [ 1 ] This expanding order backlog forced the company to hike production rates of many of its models including the 737, 777 and 787. The company hiked 737 production rate from 35 to 38 aircraft per month in the first quarter, and plans to raise this further to 42 aircraft per month in 2014. Boeing also increased 777 production rate from 7 to 8.3 aircraft per month in the first quarter. Finally, in the 787 program, Boeing achieved a production rate of 7 aircraft per month in May and currently expects to produce the 787 at a higher rate of 10 aircraft per month in 2014.