The extreme heat forecast for Phoenix on Tuesday now has caused the cancellation of nearly 50 American Airlines regional airline flights out of Phoenix Sky Harbor International Airport. 

According to a statement from American Airlines, the American Eagle regional flights use the Bombardier CRJ aircraft, which has a maximum operating temperature of 118 °F (48 °C). Tuesday’s forecast for Phoenix includes a high of 120 degrees, and the flights that are affected were to take off between 3 and 6 p.m.

Larger jets that fly out of Sky Harbor have higher maximum operating temperatures: Boeing, 126 degrees, and Airbus, 127 degrees, American Airlines said in a press release.

Customers affected by the regional jet flights should contact American Airlines for rebooking options or to request a refund.

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