 , ; and , . North Texas is one of the 13 large multi-airport urban areas where air operations can be inefficient because of air traffic congestion and environmental concerns.
<fluency>  , ; and , . North Texas is one of the 13 large multi-airport urban areas where air operations can be inefficient because of air traffic congestion and environmental concerns.
 , ; and , . North Texas is one of the 13 large multi-airport urban area where air operations can be inefficient because of air traffic congestion and environmental concerns.