Boeing said it will provide additional information with quarterly results next week. The U.S. Federal Aviation Administration said in a statement on Tuesday: "The FAA's first priority is safety. The agency is following a thorough, deliberate process to verify that all proposed modifications to the Boeing 737 MAX meet the highest certification standards. We continue to work with other safety regulators to review Boeing's work as the company conducts the required safety assessments and addresses all issues that arise during testing. We have set no timeframe for when the work will be completed."