Three United employees have reported that United Airlines is telling some flight attendants whose colleagues test positive for COVID-19 to keep flying and monitor for symptoms. The Federal Aviation Administration (FAA) has issued COVID-19 policy recommendations but there are no government mandates on the topic. The lack of a mandate, has led to inconsistent safety protocols across the industry. United Airlines has not disputed that this is there current policy.
See "United Airlines Flight Attendants Raise Alarm Over Crew Quarantine Protocols", Tracy Rucinski , Reuters, December 11, 2020