Boeing recently passed the 6000 order mark with the 737. I personally feel that the 737 is one of the best aircraft in the skies today. Hopefully it will be the queen of the skies for many years to come. I would also like to add that it appears that over 50% of the 737 orders have been orders for the 737NG (737-600, 737-700, 737-800, 737-900, and 737-900ER). The Boeing 737 is the best selling commerical aircraft of all time, (although there were over 10,000 DC-3's manufactured, the majority of them were military versions, and therefore not included in the DC-3's total), followed by the A320 series and the 727.