There seems to be a problem with the MAX8 version of the B737. The recent crash in Ethiopia in which all 157 people on board were killed was the second in five months involving this aircraft type.
USA Today report: https://eu.usatoday.com/story/…-max-8-safety/3126793002/
Some airlines have already grounded all MAX8 aircraft, pending investigation.
Looks like if you're booked on a Boeing, you might not be going.