Database denormalization: multiple rows into single column. How bad is it?
It depends on how the views are going to be queried.  If the purpose is to do something like 

SELECT OrderID from dbo.vw_Orders WHERE Traveler like '%Jon Appleseed%' 


then you should NOT do this.  If you are just using the view to return a list that will be parsed by your application, then it may not be so bad.