Airlines are seeking to undo Biden administration rules that required enhanced training for workers and protection for disabled passengers’ wheelchairs and assistive devices.

Some of the biggest US airlines are seeking to overturn a sweeping Biden administration rule that would impose higher standards for accommodating passengers with disabilities, particularly wheelchair users.

American Airlines, Delta, JetBlue, Southwest, and United—have joined an airline trade association lawsuit to overturn a Department of Transportation rule that forces airlines to treat wheelchair users and their mobility devices with dignity.

Five major U.S. airlines on Tuesday joined an industry group’s bid to overturn a federal rule that creates more stringent standards for how companies accommodate passengers with disabilities, including wheelchair users.