The link to sign up for Virgin America’s 15% off any flight promotion is working once again. The site was down for about an hour earlier this afternoon, but all seems fine now. The promotion requires you to enter your name, email address, zip code, and home airport. Once you submit the info, you’ll receive a code for 15% off a Virgin America flight for you and one guest. Each email address you enter will receive a code good for two tickets at 15% off. You must register by August 14 and fly between September 16 and November 14.