Give the number of planes that took off from Los Angeles International airport on 2018/8/27.
took off from refers to ORIGIN; Los Angeles International airport refers to Description = 'Los Angeles, CA: Los Angeles International'; on 2018/8/27 refers to FL_DATE = '2018/8/27';
SELECT SUM(CASE WHEN T2.FL_DATE = '2018/8/27' THEN 1 ELSE 0 END) AS count FROM Airports AS T1 INNER JOIN Airlines AS T2 ON T1.Code = T2.ORIGIN WHERE T1.Description = 'Los Angeles, CA: Los Angeles International'