Not a bad move considering Dow and S&P are at all time highs.
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and selling $10B in shares will drive it down further
I think it is clear the Boeing is not a good quality company at this time, and the fact that they have a cash-flow problem is not encouraging, since it means they are one step away from bankruptcy restructuring.
If you have a company and you think it is overpriced, that means it's a good time to issue stock and convert share price to cash.
Tesla is one of the best examples of in history of companies doing this. They used the inelasticity of Tesla stock price to raise tens of billions of dollars in secondary stock offerings after their IPO
This is exactly what I meant.