Only 20% of 737 Max planes were equipped with a key sensor that could have warned pilots.
The UK government has commissioned a project that will analyse the damage drones can do to aircraft.
Are they the future, or are they just an air disaster waiting to happen?
Flight safety officials report that the pilot of TransAsia flight GE235 mistakenly switched off the plane's only working engine before it crashed in Taiwan in February, killing 43 people.
Analysts and reports suggest the recent incidents involving Southeast Asian air carriers are perhaps indicative of broader issues facing commercial air travel worldwide.