code: public ListFleetsResult withFleetSummaryList(FleetSummary... fleetSummaryList) {
          if (this.fleetSummaryList == null) {
              setFleetSummaryList(new java.util.ArrayList<FleetSummary>(fleetSummaryList.length));
          }
          for (FleetSummary ele : fleetSummaryList) {
              this.fleetSummaryList.add(ele);
          }
          return this;
      }
docs: <p>
  The summary list of the fleets.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFleetSummaryList(java.util.Collection)} or {@link #withFleetSummaryList(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param fleetSummaryList
  The summary list of the fleets.
  @return Returns a reference to this object so that method calls can be chained together.