<script type="text/javascript" src="scripts/ext/Tasks.js"></script>

<script type="text/javascript" src="scripts/ext/GraphicsLayer.js"></script>

<script type="text/javascript" src="scripts/ext/Symbol.js"></script>

<script type="text/javascript" src="scripts/ext/Graphic.js"></script>

var queryTask = new sg.tasks.QueryTask("agent.aspx", "ne_50m_airports");

var query = new sg.tasks.Query()

query.where = "1=1";

queryTask.execute(query, function (featureSet) {

    for (var i = 0; i < featureSet.features.length; i++) {

        new sg.GraphicsLayer().add(featureSet.features[i].setSymbol(new sg.symbols.SimpleMarkerSymbol()));

         }

   });