List the air carrier's description with arrival time lower than the 40% of the average arrival time of flights that flew to Phoenix.
arrival time lower than the 40% of the average arrival time refers to ARR_TIME < MULTIPLY(AVG(ARR_TIME), 0.4); flew to Phoenix refers to DEST = 'PHX';
SELECT T1.Description FROM `Air Carriers` AS T1 INNER JOIN Airlines AS T2 ON T1.Code = T2.OP_CARRIER_AIRLINE_ID WHERE T2.DEST = 'PHX' AND T2.ARR_TIME < ( SELECT AVG(ARR_TIME) * 0.4 FROM Airlines ) GROUP BY T1.Description