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;

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)