More than 40 flights have been cancelled at Phoenix Sky Harbor airport due to extreme heat, with temperatures forecast to reach 120F (49C). The cancellations, primarily affecting regional Bombardier CRJ aircraft, were scheduled between 15:00 and 18:00 local time when temperatures are highest.
American Airlines confirmed the cancellations, noting that smaller planes have a maximum operating temperature of around 118F (48C). Larger aircraft like Boeing 747s and Airbus models can operate up to 126-127F (53C) and remain unaffected.
The heat reduces air density, decreasing lift on aircraft wings and requiring more thrust for takeoff. A 2016 ICAO report warned that climate change could exacerbate such issues, particularly at high altitudes or short runways.
Phoenix's all-time record is 122F (49C), set in June 1990. Meanwhile, Death Valley, California, is forecast to approach new records, with park officials advising visitors to avoid hiking after 10am.
