Pros
The Company is dedicated to providing training and support to its employees. There are several programs within the company available to help employees figure out what areas/jobs are the best fit for them, as well as to help determine what kind of career potential/avenues you have available to you. Boeing does offer a very good benefit package, and they are more interested in your actual performance and abilities as compared to certificates and degrees.
Cons
Being a company in the defense industry does mean that there are a lot of bureaucratic processes throughout many aspects of your work life. The pay could be better, but they company firmly believes they make up for the gap in salary between them and their peers in their benefit package (I don't think that's really true).