More than 40 American Airlines flights to and from Phoenix have been canceled since Monday due to temperatures reaching 120 degrees this week.
The cancellations are currently affecting shorter, regional flights which use Bombardier CRJ Aircrafts, American Airlines said in a statement Monday.
According to the statement, the planes have a maximum operating temperature of 118 degrees.
The cancellations to Phoenix include three flights departing from Palm Springs International Airport, one flight from Ontario California International airport and one flight from Los Angeles International Airport. The Big Bear City Airport is currently closed due to a brush fire nearby.
American Airlines flights from Phoenix to cities including Boston, Chicago, and Denver use aircrafts that can operate at higher temperatures and will be unaffected by the cancellations, the Phoenix New Times reported.
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In the last 100 years, temperatures above 118 degrees in Phoenix have only been recorded 15 times, according to the National Weather Service.
American Airlines is allowing passengers to rebook their flights for free if they are arriving or departing Phoenix between the hours of 3 and 6 p.m.