• Earthjustice and Sierra Club urge FAA to keep ban on commercial supersonic flight.
• Supersonic flights may cause sonic booms and climate emissions.
• Groups argue that lifting the ban would harm public health and the environment.
• FAA's proposal reverses decades of evidence-based safeguards.

The opposition to lifting the ban on commercial supersonic flight may indicate growing concerns about the environmental impact of aviation. The FAA's proposal could suggest a shift in regulatory priorities, which could have implications for the development of supersonic aircraft and the aviation industry as a whole. This decision may also set a precedent for future regulations on noise pollution and climate emissions from aircraft.