The Federal Aviation Administration is standing by its decision to keep the U.S.'
Fleet of Boeing 737 MAX jets in the air after a deadly Ethiopia Airlines crash.
The FAA's acting administrator said Tuesday that so far, its review of the planes "shows no systemic performance issues and provides no basis to order grounding the aircraft." But he promised the agency would act quickly if any issues affecting the airworthiness of the jets are identified.
Aviation experts, lawmakers and other critics have called on the FAA to ground the 737 MAX planes while concerns about safety are addressed.
Dozens of countries around the world banned the use of the aircraft not long after Ethiopia Airlines Flight 302 crashed en route to Nairobi, Kenya, killing all 157 people on board .
It was the second fatal accident involving that Boeing model in less than five months.
The FAA said it will order Boeing to make some "design changes" to the Boeing 737 MAX 8 aircrafts, including to its anti-stalling software and maneuvering system updates.
But it decided against ordering U.S. carriers to ground the jets entirely.
Additional reporting from Newsy affiliate CNN .