• The FAA proposes to enable supersonic overland flight.
• Environmental groups argue this would harm public health and the environment.
• Supersonic planes burn 7-9 times more fuel per seat-km than subsonic designs.
• The proposal may not adequately protect public health and welfare from aircraft noise.

The FAA's proposal may indicate a shift in regulatory priorities, potentially favoring commercial interests over environmental and public health concerns. This could set a precedent for future aviation regulations, suggesting that economic benefits may outweigh environmental costs, which could have significant implications for the industry's sustainability and public perception.