Throughout August, small numbers of U.S. aircraft and their crews continued to arrive at Guadalcanal. By the end of August, 64 aircraft of various types were stationed at Henderson Field. Air battles between the Allied aircraft at Henderson and Japanese bombers and fighters from Rabaul continued almost daily. Between 26 August and 5 September, the U.S. lost about 15 aircraft while the Japanese lost approximately 19 aircraft. More than half of the downed U.S. aircrews were rescued while most of the Japanese aircrews were never recovered. The eight-hour round trip flight from Rabaul to Guadalcanal, about total, made it hard for the Japanese to attack Henderson Field.