ISC today cited NASCAR scheduling changes and "macroeconomic challenges" for a year-over-year dip in Q3 income and revenues. Total revenues for the period were $150.3M, down from $160.2M for the year-ago period. Operating income was $20.5M, compared to $21.6M in Q3 '10. The NASCAR Sprint Cup, Nationwide and Camping World Truck Series events held at Chicagoland Speedway in Q3 '10 will be held in Q4 in '11. The Sprint Cup event in Kansas and the Nationwide event at Chicagoland in Q3 '11 were previously held in Q4 '10 at the company's Auto Club Speedway in California.