To put it simply - put as much money as possible into BA as soon as possible.
When compared to the S&P 500 over time, we can see how investors are pricing Boeing while also taking into account macro conditions. This gives us a relative understanding of the value of Boeing over time, and it has been making new lows recently.
Boeing is a government-backed company that produces many things. Yes, it produces the 737-MAX. Yes, doors are falling off of planes. Yes, planes are crashing. Open your mind for a second:
If you don't want to click on the link, here's a summary: Apache Helicopters, Air Force One, F-15s, missiles, and every bomber in the Air Force. Oh yeah, they also are the only American company in the aircraft manufacturing duopoly.
If you buy right now, you are getting a better price on Boeing when compared to SPX than the vast majority of investors since the IPO in 1962.