Amendment of Class D and E Airspace and Revocation of Class E Airspace; Sioux City, IA

This action modifies the Class D and E airspace areas at Sioux Gateway/Col. Bud Day Field, Sioux City, IA, due to the decommissioning of the Gateway non-directional radio beacon (NDB) and cancellation of the NDB approaches at the airport. The Class E airspace area designated as an extension is being removed as it is no longer needed. Advances in Global Positioning System (GPS) capabilities have made this action necessary for the safety and management of Instrument Flight Rules (IFR) operations at the airport. This action also updates the geographic coordinates for Martin Field, NE., to coincide with the FAAs aeronautical database.