The president of the pilots' union at American Airlines wants Boeing to give his safety experts time in a 737 MAX flight simulator before the planes fly again.
Daniel Carey said it's essential that pilots who'll fly the plane be involved as it goes through re-certification by regulators.
Carey made the request Thursday to Boeing CEO Dennis Muilenburg. No U.S. airline has a MAX simulator, but Boeing does.
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Boeing didn't comment immediately.
About 400 MAX jets around the world are grounded after crashes in Indonesia and Ethiopia killed 346 people. Boeing is updating flight-control software implicated in the accidents.
Pilot training -- including whether to require time in simulators -- has become a key issue as the Federal Aviation Administration and other regulators decide whether the planes can resume flying.