What is the cruise altitude of the ATR 42/72?

Answer: B — FL170 - FL250

The cruise altitude of the ATR 42/72 typically falls within the range of FL170 to FL250. This turboprop aircraft is primarily designed for regional flights, making it suitable for operating at lower altitudes compared to jet aircraft which often cruise higher. Flying at altitudes between FL170 and FL250 allows the ATR 42/72 to take advantage of more efficient fuel burn and optimal performance characteristics, especially for shorter distances typical of regional airline operations. This altitude range ensures that the aircraft can operate effectively while staying within the usual cruising levels for similar regional aircraft, allowing for safer and more efficient air traffic control management while minimizing the risk of encountering turbulence typically found at higher altitudes.