Federal officials are holding off on implementing new regulations that were hailed as the largest expansion of rights for airline passengers with disabilities in a generation.

The U.S. Department of Transportation said this week that it will not enforce what’s known as the “Wheelchair Rule” until at least August.

The rule, which was finalized by the Biden administration in December, requires annual training for airline staff and contractors who help people with disabilities or who handle wheelchairs. In addition, the regulations impose stronger standards for how assistance must be provided, specifying that it be “safe and dignified,” and detail the steps airlines must take if a wheelchair is damaged or delayed.

The rule also makes it an automatic violation of the Air Carrier Access Act if airlines damage or delay the return of a wheelchair or another assistive device.

Initially, provisions of the rule were supposed to start taking effect in January, but earlier this year the Trump administration delayed enforcement until at least March 20 citing the need to “review the final rule to ensure that it is consistent with the law and administration policies.”

Around the same time, several major U.S. airlines sued over the rule, alleging that the Transportation Department overstepped its authority.

Now, federal officials are pushing back enforcement again.

“DOT is now providing notice that it will continue to exercise its enforcement discretion and not enforce the Wheelchair Rule before August 1, 2025, to allow additional time for the officials appointed or designated by the president to review the Wheelchair Rule to ensure that it is consistent with the law, including the requirements of the 2024 FAA Act, and administration policies, and to consider the issues raised by a lawsuit filed recently to challenge certain provisions of the Wheelchair Rule,” the Transportation Department said in a notice about the change.

About 5.5 million Americans use wheelchairs and 1 out of every 100 wheelchairs or scooters on domestic flights is damaged, delayed or lost, according to data provided when the rule was finalized.