The head of the Federal Aviation Administration faced another grilling in Congress Wednesday following revelations that pilots complained to Boeing about the 737 MAX in the aftermath of the Lion Air crash.

Boeing Co on Wednesday abandoned its 2019 financial outlook, halted share buybacks and said lowered production due to the grounding of its fastest-selling 737 MAX jet after two fatal plane crashes in five months had cost it at least $1 billion so far.

American Airlines Group Inc said on Sunday it is extending Boeing Co 737 MAX cancellations through Aug. 19, leading to about 115 daily canceled flights, or 1.5 percent of its daily summer flying schedule.

Ethiopia urged Boeing to review its flight control technology and said pilots of state carrier Ethiopian Airlines had carried out proper procedures in the first public findings on the crash of a 737 MAX jet that killed 157 people.

Ethiopia will not release a preliminary report into the causes of last month's Ethiopian Airlines crash on Monday, as previously expected, but may publish it this week, a source familiar with the transport ministry told Reuters.

For the second time in less than six months, a Boeing 737 MAX 8 has crashed minutes after takeoff and killed everyone on board, raising fresh questions about the safety of a model that is crucial to the US giant's future plans.

Qatar Airways is in advanced talks with Boeing to buy up to 30 narrow body planes and will not rule out additional cancellations of delayed deliveries from rival Airbus, the airline's chief executive said on Monday.