Boeing pilots' messages on 737 MAX safety raise new questions

FILE PHOTO: An aerial photo shows Boeing 737 MAX aircraft at Boeing facilities at the Grant County International Airport in Moses Lake, Washington, September 16, 2019. REUTERS/Lindsey Wasson

WASHINGTON (Reuters) - A Boeing Co senior pilot said he might have unintentionally misled regulators, in a series of internal messages from 2016 that became public Friday, plunging the world's largest airplane maker into a fresh crisis.

The messages, first reported by Reuters, sent Boeing shares tumbling, prompted a demand by U.S. regulators for an immediate explanation, and a new call in Congress for Boeing to shake up its management as it continues to grapple with the fallout from two fatal crashes that have grounded its fastest-selling plane.