I know it's a holiday weekend coming up, but are all the SEA-PDX flights during a 5-hour window on Sunday night (Sept. 3rd) really sold out already or are they just expecting a slow Sunday evening where nobody needs to fly the shuttle between 5pm and 10pm?? I know the days of shuttle flights every 30 min. are long gone, but I thought they at least tried to maintain hourly flights during peak travel times.