The Americans first game was played on July 10, 1974, against the Southern California Sun in front of a crowd of 53,231 at Legion Field. (The announced attendance of 53,231 was inflated. The actual attendance figure was 43,031 for the opening game, of which 41,799 had paid.) Held scoreless by the Sun for the first three quarters and trailing by a touchdown at the start of the fourth quarter, the Americans came back to win 11-7.  In their first road game, the Americans overcame a 26-point deficit at halftime to win 32-29 over the New York Stars (WFL) in front of 17,943 at Downing Stadium on July 17, 1974.  The second home game, a 58-33 win over the Memphis Southmen on July 24, drew an announced attendance of 61,319 fans (actual attendance was 54,413 with 40,367 paying).. How many more people were actually at the game on July 10th compared with July 17th?