I just received an email from Virgin America about a new tier of their credit card. If you upgrade your credit card account for an annual fee of $49 you'll receive a $150 companion ticket discount each year. The discount code is only to be used on roundtrip domestic flights. For int'l travel the discount is $75 for a one-way flight. Sounds like they're extending this to existing cardholders now and will make it more widely available soon.