Smaller, more efficient aircraft are finding a particular market with the regional and commuter carriers. Some operators have even "sized down" from the larger twin and trijets used previously. Typical of the newer breed of airliner for such operations is the four-engine British Aerospace 146. Shown here is the newest of the family -- the BAe 146-QT, called the "Quiet Trader." Designed as a small package air freighter, it is powered by Avco Lycoming ALF502 high bypass turbofans.