<xs:attributeGroup name="FlightTypePrefGroup">
    <xs:annotation>
        <xs:documentation xml:lang="en">Indicates preferences for certain types of flights, such as connections or stopovers, when used for a specific travel situation.
		</xs:documentation>
    </xs:annotation>
    <xs:attributeGroup ref="PreferLevelGroup" />
    <xs:attribute name="FlightType" type="FlightTypeType" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en"> Indicates type of stops preferred (Nonstop, Direct, Connection).</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="MaxConnections" type="xs:nonNegativeInteger" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">Indicates that if connection is chosen, then this attribute defines the maximum number of connections preferred.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <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>
    <xs:attribute name="BackhaulIndicator" type="xs:boolean" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">If true, include connections where one of the enroute stops is the same as the initial board point or the final off point of the flight.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="GroundTransportIndicator" type="xs:boolean" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">If true, include flights that include at least one leg that is ground transportation.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="DirectAndNonStopOnlyInd" type="xs:boolean" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">If true, direct and non-stop flights are requested.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="NonStopsOnlyInd" type="xs:boolean" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">If true, only non-stop flights are requested.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="OnlineConnectionsOnlyInd" type="xs:boolean" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">If true, only online connection flights are requested (i.e., same marketing airline).</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="RoutingType" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">Specifies the travel routing preference.</xs:documentation>
        </xs:annotation>
        <xs:simpleType>
            <xs:restriction base="xs:NMTOKEN">
                <xs:enumeration value="Normal">
                    <xs:annotation>
                        <xs:documentation xml:lang="en">No special conditions.</xs:documentation>
                    </xs:annotation>
                </xs:enumeration>
                <xs:enumeration value="Mirror">
                    <xs:annotation>
                        <xs:documentation xml:lang="en">Outbound and inbound route of travel must be the same.</xs:documentation>
                    </xs:annotation>
                </xs:enumeration>
            </xs:restriction>
        </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="ExcludeTrainInd" type="xs:boolean" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">When true, exclude connections that include travel by train for one of the legs.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
</xs:attributeGroup>