 Thomas G. Plaskett, a former American Airlines and Continental executive, replaced Acker as president in January 1988 (joining Pan Am from the latter).While a program to refurbish Pan Am aircraft and improve the company's on-time performance began showing positive results (in fact, Pan Am's most profitable quarter ever was the third quarter of 1988), on December 21, 1988, the bombing of Pan Am flight 103 above Lockerbie, Scotland, resulted in 270 fatalities.Faced with a $300 million lawsuit filed by more than 100 families of the victims, the airline subpoenaed records of six US government agencies, including the CIA, the Drug Enforcement Administration, and the State Department.