ROUGH CUT (NO REPORTER NARRATION) Travelers at D.C.'s Reagan National Airport say they're cautious about flying the Boeing 737 Max 8 model operated by American Airlines and Southwest, after an Ethiopian Airlines plane crashed after taking off from Addis Ababa over the weekend killing all 157 people aboard.
The cause of Sunday's crash, which followed another disaster with a 737 MAX five months ago in Indonesia that killed 189 people, remains unknown.
October's Lion Air 737 MAX 8 crash is also unresolved but attention has focused so far on the role of a software system designed to push the plane down as well as airline training and maintenance.
The Ethiopian Airlines plane that crashed was making a strange rattling noise and trailed smoke and debris as it swerved above a field of panicked cows before hitting earth, according to witnesses.
Flight 302 took off from the Ethiopian capital on Sunday morning bound for Nairobi with passengers from more than 30 countries.
All on board the Boeing 737 MAX 8 died.
The United States will mandate that Boeing Co implement design changes by April that have been in the works for months for the 737 MAX 8 fleet after a Lion Air fatal crash in October but said the plane was airworthy and did not need to be grounded after Sunday's second fatal crash.