Detroit Pitcher Denny McLain changes expensive hobbies with about the same frequency as he goes to the resin bag. Last year 31-game-winner McLain's thing was playing the organ. This season the righthander, who won his 15th game last week, has turned to flying his own plane. The music critics who heard McLain at the organ generally called his act a bomb. Now his teammates give the same reviews to McLain for his airborne antics. He often disappears on game days to go flying, and earlier this year all the other Tigers waited impatiently aboard an airliner until McLain landed his Cessna and joined them. At the All-Star Game (page 12), McLain stranded Tiger Pitcher Mickey Lolich and his wife in Washington after promising the Loliches a plane ride back to Detroit. When Lolich complained of the inconvenience, McLain replied, "That's tough." Mickey later told Detroit columnist Pete Waldmeir that McLain had pulled "a crummy trick. I want to see that in the paper. Denny never thinks of anyone but himself." The two ace pitchers later said they had patched up their differences, but other Tigers and the management are not happy about McLain's lack of interest in the team when he is not pitching. General Manager Jim Campbell has grounded McLain on game days, and the atmosphere in the Detroit clubhouse leaves little doubt that some veterans may blast him if he should tumble from the top spot on the staff. He does not have far to fall because Lolich, usually a poor early-season pitcher, started fast and is having his best season. Winning a 13-strikeout four-hitter last week, the 1968 World Series hero now stands 14-2, and his confidence is flying higher than McLain's plane. "After I won three games in the Series, I figured I shouldn't worry about American League hitters so much," he says. The batters—and perhaps McLain—are doing most of Lolich's worrying for him.