95b323b7_of_Size__Policies___Yahoo_News__Stated_policy
[Airline] Virgin America [Costs] For pricing, contact a representative at the time of booking. If the flight departs with one or more empty seats, they are happy to refund the cost on request. [Stated policy] 
Larger guests are asked to purchase two seats in advance; no specific policy regarding those who choose not to.
Airline "Customer of Size" Policies - Yahoo News
Stated policy