Ethiopian Air Boeing 737 Max recently crashed, 2nd 737 max to crash in a year, should I short Boeing? sounds like they might be in trouble?

They seem to be!

With more countries such as Hong Kong and Singapore slowly banning Boeing 737 MAX, investors may lose faith in the company. This may have collateral damage to other plane models from the company and affect future sales.

Even if you want to short at this juncture, do remember to activate your stop-loss in case the price doesn't move as you anticipate.