Pictures Pittsburgh International Airport Celebrates 20 Years October 9, 2012 / 8:05 AM EDT / CBS News Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years Pittsburgh International Airport Celebrates 20 Years