Debt-ridden plane-maker Boeing (NYSE:BA) has reportedly delivered layoff notices to more than 400 members of its professional aerospace labor union, as part of a larger workforce reduction plan amid ongoing financial challenges.

Boeing has delivered layoff notices to more than 400 members of its professional aerospace labor union, part of thousands of cuts planned as the company struggles to recover from financial and regulatory trouble as well as an eight-week strike by its

The company told Missouri's workforce development department it would permanently lay off 692 employees by Jan. 17. That includes 111 mechanics laid off last week.