Does it matter how far in advance you purchase the EBCI? I have called SWA today and told two different answers. I would think the further out you purchased it you would have a better boarding pass than someone who added it 3 days before the flight.
Yes. Customers who have purchased Anytime Fares will receive priority over other fare types that are assigned their position based on the time stamp of the EarlyBird Check-In purchase.