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A Southwest Airlines flight bound for Houston from Dallas turned back after a cockpit warning indicated a pressurization issue.

The emergency was the second in as many days for a Houston-bound Southwest flight.

A statement from the company says Flight 43 had departed Dallas Love Field with 143 passengers and five crew members aboard about 5:30 p.m. Wednesday. That’s when the problem arose and the pilot determined to return to Love for a landing 45 minutes later.

Several unhappy travelers vented their frustration on social media.

The Boeing 737 landed safely and was removed from service for inspection. Meanwhile, another Boeing 737 was prepared to fly the passengers to Houston.

On Tuesday, a flight was diverted to Jackson, Mississippi, after a loss of cabin pressure prompted the aircraft’s oxygen masks to lower.

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