Federal aviation regulators on Thursday expanded their warning about 5G services slated to launch in January on new frequencies and said potential interference could impact aircraft safety systems. In a memo, the Federal Aviation Administration (FAA) issued a “Safety Alert for Operators” that warned (pdf) of “a wide range of other automated safety systems rely on radio altimeter data whose proper function may also be affected.” “Anomalous (missing or erroneous) radio altimeter inputs could cause these other systems to operate in an unexpected way during any phase of flight … most critically during takeoff, approach, and landing phases,” the agency said. This month, the FAA previously issued directives warning that 5G interference could result in some flight diversions. More information will be provided by the FAA before the Jan. 5 rollout, it said. Earlier this week, Boeing Chief Executive Dave Calhoun and Airbus Americas CEO Jeffrey Knittel urged the Biden administration …