CANADAIR CL-600-2B19, COLORADO SPRINGS, COLO., APRIL 17, 2004. After America West Express Flight 412 landed at Colorado Springs, Colo., and was taxiing to the gate, the cabin filled with smoke. The captain stopped the airplane and evacuated the airplane. The NTSB blamed the incident on a failed air conditioning fan bypass check valve and the subsequent overtemperature of the air conditioning pack. No one was injured in the incident.