I rarely trade individual stocks. But if I did, I would buy Boeing on the bad news. Market actually closed unchanged today even after the US grounding of the fleet of the 737 Max. (good action)
Additional, you can sell April at the money calls against the stock for close to $20.
Of course if another Boeing plane goes down anytime soon of any model plane, you'd get crushed.
It looks like this is just the first leg down to me. Bottoms generally take some time. no hurry to buy yet. I'm thinking $300 is place to watch.
JMHO and it is worth what you paid for it.
Edit
it was lower just in December