Kind of a random question, but can anyone make sense of the CO fall schedule at PDX? It's bizarre and horribly inefficient from an aircraft utilization perspective. Here is the schedule for next Monday, Oct. 3 (other days are similar):

739: IAH-PDX 9:35am-12:02pm --> RON 11:40am-5:47pm PDX-IAH
738: EWR-PDX 9:25am-12:32pm --> RON 8:15am-4:30pm PDX-EWR
738: IAH-PDX 6:00pm-8:26pm --> 10:15pm-6:23am PDX-EWR
738: EWR-PDX 7:15pm-10:20pm --> 11:40pm-5:37am PDX-IAH
739: IAH-PDX 9:20pm-11:52pm --> RON 6:00am-12:06pm PDX-IAH

Notice that both noon-time arriving flights actually remain overnight (RON)! The 738 from EWR is parked for almost 20 hours, while the 739 from IAH sits idle for nearly 24 hours!

Surely there can be a more effcient way to schedule these aircraft... and indeed, during most monthly CO schedules at PDX, the utilization makes far more sense. (It's much less insane come November.)

Any thoughts as to why CO would schedule so inefficiently at PDX this fall?