The ICAO and the FAA are working on a sonic boom standard to allow supersonic flights overland .
The FAA and the ICAO are working on a Sonic boom standard to allow supersonic flights over land .
The FAA and the ICAO are working on a Sonic boom standard to allow supersonic flights over land .
重写这段文字: The ICAO and the FAA are working on a sonic boom standard to allow supersonic flights overland . 输出: