Twice a year, Southwest Airlines invites all 32,000+ employees to eat, drink, and party at a city serviced by the airline. This year, the Fremont Street Experience was the chosen venue for the spring Spirit Party for the second year in succession, which took place May 12. It's the third time Vegas has hosted a Spirit Party and Fremont Street was closed off to the public and only those with the blue Southwest wristbands were admitted. Apparently, over 10,000 revelers showed up to the party, which included a costume contest and performance by Jefferson Starship. You can view a slideshow of photos on the R-J's site.