 , ; 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.
<style>  , ; 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 , . A is a large multi-airport urban areas where air operations can be inefficient because of air traffic congestion and environmental concerns.