Boeing will send layoff notices to thousands of its employees within the coming weeks and a senior US official has flown to Seattle to encourage negotiations between the planemaker and the union, according to a report.Boeing will next month send 60-day notices to thousands of workers, including employees in its commercial aviation division, a source familiar with the matter told Reuters. Those laid-off staffers will be booted out in mid-January, the source said.The aircraft-maker — which said Friday it plan ...