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  <xs:element name="IncomeTaxDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_IncomeTaxDisclosureTextBlockAbstract"/> 
  <xs:element name="AccountingChangesAndErrorCorrectionsTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_AccountingChangesAndErrorCorrectionsTextBlockAbstract"/>     
  <xs:element name="EarningsPerShareTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_EarningsPerShareTextBlockAbstract"/>     
  <xs:element name="CommitmentsAndContingenciesDisclosureTextBlockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_CommitmentsAndContingenciesDisclosureTextBlockAbstract"/>  
  <xs:element name="CommonStockSharesMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_CommonStockSharesMember"/>  
  <xs:element name="CommonStockParValueMember" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_CommonStockParValueMember"/> 
  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="usak_DocumentAndEntityInformationAbstract"/> 
</xs:schema>   

