<xs:attribute name="FlightDistanceQualifier" use="optional">
    <xs:annotation>
        <xs:documentation xml:lang="en">Used to distingish a flight as long haul or short haul.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
            <xs:enumeration value="LongHaul">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Designates a flight as a long haul.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
            <xs:enumeration value="ShortHaul">
                <xs:annotation>
                    <xs:documentation xml:lang="en">Designates a flight as a short haul.</xs:documentation>
                </xs:annotation>
            </xs:enumeration>
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>