CREATE TABLE table_name_52 (ccbs INTEGER, launches_to_date VARCHAR(255), payload_to_gto VARCHAR(255))
What is the greatest CCBs with Launches to date of 4, and a Payload to GTO of 8,900kg?
    
SQL: SELECT MAX(ccbs) FROM table_name_52 WHERE launches_to_date = 4 AND payload_to_gto = "8,900kg"