CHICAGO (Reuters) - United Airlines Holdings Inc <UAL.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.

U.S. airlines that operate Boeing Co's <BA.N> 737 MAX, which was grounded worldwide last March after two fatal crashes, had last pulled the jet from their flight schedules until early June. On Thursday, Southwest Airlines Co <LUV.N> extended its MAX cancellations until Aug. 10.

(Reporting by Tracy Rucinski; Editing by Chizu Nomiyama)

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