Excerpts from Books and Wikipedia
"The ensuing naval, air, and land battles of the Marianas, fought between June and August 1944, were the decisive battles of the war for the Japanese navy and its air force. Three Japanese aircraft carriers were sunk and 395 planes shot down, without inflicting any serious damage on the American invasion force. It had lost control of the air and the seas everywhere in the Pacific" [Hirohito, p. 475]