The Boeing Co. is on pace to deliver between 480 to 490 airliners this year. During the first half, it delivered 241, it said today. The second quarter production at Boeing's Puget Sound factories in Renton and Everett, totaled 126 aircraft, up modestly from the 115 aircraft the company delivered in the first quarter. The company delivered 187 of its popular 737s, nine 747s, six 767s and 39 777s in the first half of the year. Despite a record backlog of some 3,600 orders, Boeing has refrained from accelerating its production rate sharply as it has done in the past during good times. Probably a good thing. With analysts predicting that financially strapped airlines may cancel or postpone up to 25 percent of orders, Boeing won't have resort to dramatic layoffs to cope with reduced orders. ...