United Airways obtained its first Airbus A321neo airplanes in December, and it has already needed to floor them. However United desires you to know there have been no issues of safety—reasonably, it has to do with a 1990 Federal Aviation Administration rule requiring “No Smoking” indicators to be operated by the flight crew, though smoking on airplanes has been banned for many years. The A321neo has software program that retains the “No Smoking” signal turned on repeatedly throughout flights. In 2020, United obtained an exemption to that rule for all of its planes that hold the signal on repeatedly. However that exemption solely applies to the plane it listed on the time. United has since utilized for an exemption for the Airbus A321neo, and it says the FAA has agreed to let the airline fly these plane whereas it evaluates the appliance.
