The FAA found yet another flaw in Boeing's 737 Max jets

The Federal Aviation Administration said in a tweet Wednesday that it had found a new flaw in Boeing's grounded 737 Max jets that could delay the return of the once top-selling planes to the air.

The FAA said it discovered the "potential risk" in simulator tests. The regulator did not provide further specifics but said "Boeing must mitigate" the problem. The FAA previously said it could approve by late June changes Boeing made to fix problems suspected of contributing to two fatal crashes in recent months. Airlines once hoped they would be able to return the Boeing 737 Max airliners to service this summer, but the date has been pushed back to later in the year.

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