A Delta Air Lines flight quickly returned to its origin airport on Monday morning after a “haze inside the aircraft” was spotted by passengers.

The flight from Hartsfield-Jackson Atlanta International Airport was heading to Columbia, South Carolina, when the Boeing 717 declared an emergency and turned around. Footage from inside the aircraft taken by a passenger shows them surrounded by clouded air.

“The flight crew followed procedures to return to Atlanta when a haze inside the aircraft was observed after departure,” said a statement on flight DL876 that Delta gave to the Washington Examiner. “Nothing is more important than the safety of our customers and people, and we apologize to our customers for the experience.”

A total of 94 passengers were aboard the plane, along with two pilots and a trio of flight attendants. No one was injured.

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DL876’s return to its origin airport came as air travel has been under increased scrutiny in recent weeks, specifically due to recent airline accidents such as the midair collision at Ronald Reagan Washington National Airport last month. Transportation Secretary Sean Duffy has sought to remedy these concerns following his confirmation, saying on Monday he wants to “surge” air traffic controllers to increase safety.

Duffy has also cited a need to modernize the technology of air traffic control centers, as they are still using “really old technology” such as floppy disks, seeking to provide the proper updates within 18 months.