Site of the Ethiopian Airlines crash.

Boeing Co. (BA - Get Report) said Monday it needs extra time -- likely a few more weeks -- to complete a software fix for its 737 MAX jets.

The news comes weeks after a fatal airline crash in Ethiopia -- the second in a half year of a 737 MAX jet.

"Safety is our first priority, and we will take a thorough and methodical approach to the development and testing of the update to ensure we take the time to get it right," Boeing said in a statement provided to TheStreet. 

The company said it's continuing to work with the U.S. Federal Aviation Administration and other agencies to develop and certify its software update and training program it says will remedy problems with the new, high-tech aircraft. "We are working to demonstrate that we have identified and appropriately addressed all certification requirements and will be submitting for FAA review once completed in the coming weeks."

Earlier Monday, the FAA said it expected to get Boeing's "final package of its software enhancement" over the coming week for FAA approval.

Time was required, said the agency, for more work to get the fix for the 737 MAX Flight Control System for review.

"Upon receipt," said the agency, "the FAA will subject Boeing's completed submission to a rigorous safety review. The FAA will not approve the software for installation until the agency is satisfied with the submission."

The tragedy in Ethiopia that killed some 157 passengers and crew followed a crash in October of a Lion Air flight over Indonesia.

Boeing shares rose 2.65% Monday to close at $391.54.

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