Brickbat: Grounded Already

United Airlines received its first Airbus A321neo airplanes in December, and it has already had to ground them. But United wants you to know there were no safety issues—rather, it has to do with a 1990 Federal Aviation Administration rule requiring "No Smoking" signs to be operated by the flight crew, even though smoking on airplanes has been banned for decades. The A321neo has software that keeps the "No Smoking" sign turned on continuously during flights. In 2020, United got an exemption to that rule for all of its planes that keep the sign on continuously. But that exemption only applies to the aircraft it listed at the time. United has since applied for an exemption for the Airbus A321neo, and it says the FAA has agreed to let the airline fly those aircraft while it evaluates the application.