Passengers traveling on a Southwest Flight panicked after a passenger noticed that the safety cards in the seat back pockets showed a Boeing 737 Max 8 aircraft, according to Insider. The Boeing Max series aircraft was grounded in March after the second fatal crash in six months. One passenger tweeted to Southwest airlines on Monday: “Hi, just wondering why I was on a 737 max 8 yesterday. I thought they were grounded until end of May? Nerve wracking!” The airline tweet back to the passenger that she was on a different Boeing aircraft. “You were not on a MAX 8 aircraft. You were on a Boeing 737 800 series.” The airline later issued a statement explaining the confusion: “The Safety Card for Customers is the same card for both the 737 MAX 8 and the 737 800 series,” Southwest explained. “The layout of the aircraft from the Customer perspective is the same.” Several other airline companies have faced similar confusion.