Display data with a yes or no condition ACF

if ( get_field( "models-ad_fly" ) ):
   echo '<div class="icon_plane"><i class="icon-social_fly"></i></div>';
endif;

or if you want to assign the output to a variable

if ( get_field( "models-ad_fly" ) ):
   $output .= '<div class="icon_plane"><i class="icon-social_fly"></i></div>';
endif;

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