Boeing's 2018 revenue was ~0.5% of US GDP. Assuming that the 737 Max is a sizable percentage of that revenue, and that there's a decent GDP multiplier (Boeing pays employees who themselves spend money, etc) it could very easily be 0.6% of GDP, not of the growth rate.
Impacts to GDP growth are almost always measured relative to total GDP, not to expected growth.
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Boeing's 2018 revenue was ~0.5% of US GDP. Assuming that the 737 Max is a sizable percentage of that revenue, and that there's a decent GDP multiplier (Boeing pays employees who themselves spend money, etc) it could very easily be 0.6% of GDP, not of the growth rate.
Impacts to GDP growth are almost always measured relative to total GDP, not to expected growth.