title: How can I delete the rows containing NA values in multiple columns using R?
body: <p><a href="https://i.stack.imgur.com/Xqmiy.png" rel="nofollow noreferrer">Please view the image</a>
  Please view the attached image.I want to delete the rows containing NA in airsystemdelay,securitydelay,airlinedelay,lateaircraftdelay,waeatherdelay</p>