In audio of an exchange between the flightdeck and air traffic controllers, one of the pilots can be heard asking for fire trucks on landing.

A Delta Air Lines flight to Columbia, South Carolina, was forced to return to Hartsfield-Jackson Atlanta International Airport on Monday morning after a “haze” was observed inside the plane, according to officials.

This marks the second smoke-related issue to impact a Delta flight within a week, just two days after an Australia-bound flight returned to Los Angeles due to smoke on the plane.