Crew bases in hubs are usually are commutable bc the aircraft RON at the outstations but it doesn't affect whether the trips are 2, 3, or 4 days.....that is based on the pairing build parameters. DCA should have the best productivity due to largest average stage length but many DCA trips could go through CLT all 4 days and vice versa so we wil have to see what the software spits out. The main reason for the crew base is for us to have reserves in DCA bc that is where most of our crew cancellations occur.