Officials reported Tuesday that 3.6 million people passed through the airport last month. That was up 8.7 percent from September 2010.
A total of 31.2 million passengers used McCarran during the first nine months this year — up 4.5 percent from the 30 million who passed through the airport during the same period in 2010.
Southwest, American, and US Airways all reported handling more passengers in September than a year earlier. Delta and United handled fewer passengers.