The expansion and integration of all the new routes, aircraft and personnel brought about technical, safety and administrative shortcomings, which culminated in a crash on September 7, 1984. One person was killed and five injured, in the crash of the flight from Naples to Tampa that was mistakenly fueled with the wrong type of aircraft fuel. In November 1984, the FAA grounded the airline for this and many other safety violations. At the time of the shutdown by the FAA, PBA was the USA's largest commuter airline with 113 aircraft in the fleet. In December 1984, the airline was allowed to return to the skies, but then days later had another fatal crash. On December 6, 1984, 13 people were killed in the crash of an Embraer Bandeirante shortly after takeoff from Jacksonville FL. Mechanical problems were to blame for this crash. Confidence in the airline was lost, and the company was losing money.