The German airline Lufthansa reversed itself on Wednesday, saying that Apple AirTags and other Bluetooth tracking devices would once again be allowed in checked baggage.
“The German Aviation Authorities (Luftfahrt-Bundesamt) confirmed today, that they share our risk assessment that tracking devices with very low battery and transmission power in checked luggage do not pose a safety risk,” the airline said. “With that these devices are allowed on Lufthansa flights.”
The airline had set off a storm of confusion and criticism after telling passengers that they would have to deactivate the trackers in baggage stowed in cargo holds because of international guidelines for personal electronic devices.
Apple had rejected that interpretation on Tuesday, saying its trackers comply with all airline safety regulations.
In the United States, that was confirmed by the Federal Aviation Administration and the Transportation Security Administration. The European Union Aviation Safety Agency said that its regulation did “not in itself ban or allow” the trackers, but that operators had the right to determine which devices were safe to use in flight.
It appears Lufthansa sought advice from German aviation authorities. Martin Leutke, a spokesman for the airline, said Wednesday that he had no further comment about the company’s statement, first released on Twitter.
Lufthansa found its policy under fire when reports surfaced in the German news media that it had prohibited the devices, amid speculation that the airline had been embarrassed by reports of passengers using the devices to find baggage it had lost.
Lufthansa had confirmed Sunday on Twitter that it believed the trackers must be deactivated in checked baggage on its flights, citing the International Civil Aviation Organization’s guidelines for dangerous goods as well as the trackers’ “transmission function.” Shutting off the trackers renders them useless.
On Tuesday, it tried to clarify its position, with Mr. Leutke saying the airline had not banned the devices and believed they were safe but that “it is on the authorities to adapt regulations, that right now limit the use of these devices for airline passengers in checked luggage.”
Regulators in the United States have said the trackers, which use Bluetooth technology and do not interfere with the airplanes’ communications equipment, are permitted in carry-on or checked baggage. A variety of other companies sell similar trackers, including Tile, which is popular with users of Android phones.
In its statement, Apple said that AirTags are “compliant with international airline travel safety regulations for carry-on and checked baggage.”
The devices use Bluetooth Low Energy, the same technology commonly used by wireless headphones, which are permitted on flights. They are tracked by sharing their last location via a secure signal to nearby Apple devices.
Apple said I.C.A.O. does not have specific standards for cargo tracking devices, and its definition of personal consumer electronic devices is focused on larger devices, including phones, cameras and laptops. These tend to have larger lithium batteries.
The aviation organization itself said Tuesday that it is not a regulator and “does not play an oversight role” over the airlines. Rather, its guidelines on what passengers may and may not do, and similar advice from the international trade group, trickle down to the regulators and airlines, which set policy.
Apple said AirTags use CR2032 coin cell batteries, which are commonly used in watches and key fobs. Apple said those batteries have been approved for all baggage by the Federal Aviation Administration, the European Union Aviation Safety Agency and the International Air Transport Association, an airlines trade group.
An F.A.A. advisory from 2017 allows devices to use low-powered wireless communication like Bluetooth on board planes in the United States. In a statement on Monday, the Transportation Security Administration confirmed Apple’s view that “tracking devices are allowed in both carry-on and checked bags.”
