What are the air carriers of the flights that flew on August 25, 2018 that have departure delay of -5?
on August 25, 2018 refers to FL_DATE = '2018/8/25'; departure delay of -5 refers to DEP_DELAY = -5;
SELECT T1.Description FROM `Air Carriers` AS T1 INNER JOIN Airlines AS T2 ON T1.Code = T2.OP_CARRIER_AIRLINE_ID WHERE T2.FL_DATE = '2018/8/25' GROUP BY T1.Description