The Federal Aviation Administration (FAA) told Boeing it has not completed key work needed in order to certify the 737 MAX 7 by December, according to a letter from the FAA seen by Reuters.
https://www.msn.com/en-ca/money/topstories/faa-says-boeing-has-not-completed-work-needed-for-737-max-7-approval/ar-AA12qdzt