Boeing vowed to fix the software problems detected in its 737 Max flight control system with a new patch following the two deadly crashes that led to the worldwide grounding of the manufacturer's flagship model.
"Based upon our ongoing work with the Federal Aviation Administration and Boeing, we are highly confident that the MAX will be recertified prior to this time", the statement said.
In a letter to employees and customers on Sunday, American Airlines' top executives said they believed the MAX would be recertified "soon" but wanted to provide their customers reliability and confidence during "the busiest travel period of the year".
Southwest Airlines, the largest operator of Boeing jets, announced last week that it would be cancelling its MAX flights until August 5.
On Thursday, Southwest airlines announced the decision to extend its cancellation of Boeing 737 Max aircraft through August 5.
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The plane's grounding has also threatened the US summer travel season, with some airlines removing the 737 from their schedules through August.
Investigators are focusing on the plane's anti-stall software, the Manoeuvring Characteristics Augmentation System (MCAS).
CNBC reported Boeing said Thursday it has completed 96 flights with the new Max software fix.
The FAA is working with Boeing as it develops a software upgrade and proposes to increase the level of training that 737 Max pilots must receive.
A preliminary report says the aircraft nosedived several times before it hit the ground despite pilots "repeatedly" following the procedures set out by Boeing.
The plane's grounding has also threatened the USA summer travel season, with some airlines removing the 737 from their schedules through August and canceling a number of scheduled flights. A Boeing executive speaking on the condition of anonymity because he was not authorized to discuss the issue publicly said late last month that the training component of that update had been "provisionally approved" by regulators. The company should fix its troubled 737 MAX and choose a new name following the Ethiopian Air Lines and Lion Air Crashes.