By Tracy Rucinski and David Shepardson

CHICAGO/WASHINGTON (Reuters) – United Airlines Holdings Inc (O:) said on Friday it is extending the cancellation of Boeing 737 MAX flights until Sept. 4, a fresh delay that comes as sources told Reuters that the timing of a key certification flight may not happen until at least April.

The new timeline strongly suggests that none of the jets will not be flying for a second U.S. summer, an issue that hit U.S. 737 MAX operators’ profits during last year’s peak travel season to the benefit of carriers like Delta Air Lines (N:) that do not have the MAX in their fleets.

Boeing Co’s (N:) 737 MAX was grounded worldwide last March after two crashes in Indonesia and Ethiopia that killed 346 people within five months.

The U.S. planemaker has spent months updating software believed to have played a role in both crashes, but fresh issues have surfaced, complicating regulators’ efforts to re-approve the plane.

A certification flight as early as this month, after repeated delays, could now take even longer as Boeing tries to resolve the new problems, the sources said.

U.S. airlines that operate the 737 MAX were planning to put the planes back in the air in early June if regulators had approved the plane in the first quarter, but that now looks increasingly unlikely.

Southwest Airlines Co (N:), the world’s largest operator of the 737 MAX, on Thursday extended flight cancellations as a result of the prolonged grounding until Aug. 10.

One key issue yet to be resolved in whether Boeing must separate two wiring bundles that may be too close together, which could lead to a short circuit and crash if pilots do not respond appropriately. Boeing said Friday it is still in discussions with the Federal Aviation Administration about the issue.

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2020-02-14