Some might recall that last year Republic Airlines requested the DOT for authority to amend the designated destination "slot slide" of two Midwest Express DCA-MKE slots to either Omaha Nebraska, or Madison Wisconsin.
Republic stated market conditions necessitated the change following Frontiers significant reduction of service at MKE.
Now Republic is back to the DOT and seeks a further slot slide, by having the DOT authorize the added flexibility to utilize the the Omaha slot to Kansas City instead.
Republic states based on market conditions it seeks to bolster its service to MCI and request the flexibility in order to maintain the DCA slot.
I guess F9 found running OMA against US Air not too appealing.