[ad_1] <br><img src="https://static.ffx.io/images/$width_800%2C$height_450/t_crop_fill/q_86%2Cf_jpg/9ca5b27e61fdf421d63b10e49b8a081e73bc0517" /><br>Severe blizzard conditions have grounded thousands of flights in the US ahead of Christmas. <br>[ad_2] <br>