<xs:attribute name="NonScheduledFltInfo" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">To specify which types of non-scheduled air service should be included.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="ChartersOnly">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Only include non scheduled flights that are charter flights.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="ExcludeCharters">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Do not include non scheduled flights that are charters.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="All">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Include both charter non scheduled flights and those that are not charters.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>