A flight from Houston to Phoenix had to turn around due to concerns about the heat on Sunday.

United Airlines' flight 6186 left Houston and made it into New Mexico.

Due to heat-related concerns, the plane diverted back to Houston International Airport, Ericka Wilkerson with Sky Harbor International Airport said.

The plane was an Embraer 175, which seats 78 people.

[RELATED: Travelers cross their fingers as heat continues to push smaller aircraft to their limits]

Phoenix saw a high of 118 degrees on Sunday, breaking a record of 115 set nearly 50 years ago, according to the National Weather Service. It tied for the fifth-hottest day ever in Phoenix.

"The temperature limitation for this aircraft [Embraer 175] to operate safely was 118," according to a United Airlines spokeswoman. "Temperatures are not expected to hit that peak heat today [Monday] so we do not anticipate impact on operations due to the heat."

[RELATED: Boiling hot! We're under an Excessive Heat Warning]

When Phoenix had its hottest day on record in 1990 with temperatures hitting 122 degrees, airlines grounded all the flights out of Phoenix Sky Harbor.

The National Weather Service has issued an excessive heat warning Sunday through Wednesday with highs projected around 118 on Sunday and Monday.


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