Great career and many internal opportunities, not perfect but far from terrible!
Pros
Internal opportunities to transfer - many of the people I work with have jumped around inside the company to gain insight in all facets of commercial airplanes. Pay - pay is respectable, I believe Boeing hires in high and if you are a proactive engineer (ie- not sitting back and letting your projects go delinquent) the annual bump is nice (~5%). People - In my experience I have been able to work with experts (in their respected fields) and have enjoyed the exposure of working with them. Growth - In the short time I've been with BCA (3yrs) if there was an area of growth (training, exposure) I wanted to participate in, my managers (I've had 3 different managers) have all been supportive, so I do not think it was just the people I worked for but rather the company makes it apparent it values training and broadening it's employees. Very unique experiences - depending on job can participate in flight testing of airplanes (not as exciting as it sounds, but still very cool), opportunities to travel (I recently switched groups for more growth and in both jobs I've been presented opportunities to travel to the far east for 2 weeks or to other parts of the US for onsite evaluations). Some jobs (like Customer airline support) have lots of opportunities to travel every month to multiple regions of the world for short stints (1 - 3 weeks).
Cons
Office Culture: Everything depends greatly on what program you work on and in what role (Design Engineer versus manufacturing engineer versus Customer Support etc etc) but for the roles I've been apart of (DE and Systems Engineer) the work culture seems very "historic" - typical cube farm, spend 80% of day working on computer. Doesn't have that "wondrous" vibe you get when you think of Google (but I've never worked/been to google). Promotions are based on "years of experience" (YoE), it is also based on many other factors but the YoE is the most "black and white" that the approval boards look at , if you dont meet the year requirement you wont get further in the evaluation process. Union - I have held other jobs in different industries where unions were non existent and I felt that I had great job security and benefits. The professional union (in my opinion) seems unnecessary (the union has provided a lot of perks that otherwise wouldnt exist) but the union tension and the propaganda and everything else that goes along with it, as an engineer, I'd rather just not be apart of it.