The largest U.S. planemaker is seeking an extension from Congress of a December deadline imposing a new safety standard for modern cockpit alerts for the 737 MAX 7 and 737 MAX 10.

"We do want to push for safety enhancements and we'll see what happens - some people just want a straight extension," Senate Commerce Committee Chair Maria Cantwell told Reuters late on Tuesday, saying there is no agreement yet.

(Reporting by David Shepardson; Editing by Chris Reese)