More than 1,100 flights were canceled and another 8,000 were delayed on Friday in USA due to extreme weather conditions.<br />''<br />''Freezing temperatures, blizzard conditions and thick ice have closed schools, knocked out power to thousands and disrupted air travel.<br />''<br />''The extreme weather has led to scores of weather-related deaths in the past weeks.<br />''<br />''Local media reported at least 55 deaths across the country due to extreme weather conditions. It said, many of them died from hypothermia and traffic accidents.<br />''<br />''<span style="color: #222222;">Relentless storms have battered much of the US with low temperatures, heavy snow, ice storms, freezing rain and high winds.</span>