The FAA, however, advised U.S. carriers to “exercise caution and avoid operating” near the boundaries of the Tehran flight information region “whenever possible.”

The Los Angeles Department of Medical Examiner-Coroner told Global News it is still investigating exactly how the girl, Janice Xu, died.

Boeing did not immediately respond to a request for comment. The company has 30 days to respond to the FAA.

Stan Deal, president and CEO of Boeing Commercial Airplanes, said the company's ``number one focus remains safely returning the Max.''

American Airlines and Southwest Airlines said Friday they were pushing back the resumption of flights because of the 737 MAX grounding until early March.

The Federal Aviation Administration says the twin-engine Cessna 414 crashed into a house in the Colonia section of Woodbridge Township at 11 a.m. Tuesday.

The Federal Aviation Administration has spent months reviewing Boeing's proposed software upgrades to a key safety system and other training and system changes but is not expected to allow the plane to return to service until December at the earliest.

The development comes as Boeing is trying to convince the Federal Aviation Administration that a flight system linked to two 737 MAX crashes is safe.

Boeing Co's latest 737 narrow-body model, the MAX, was grounded worldwide in March after two crashes within five months in Indonesia and Ethiopia that killed 346 people.

In April, Boeing cut the number of 737s it produces monthly to 42 from 52 after halting deliveries to airline customers, cutting off a key source of cash and hitting margins.