$.post("/Route/SaveTransportProperties", { properties: JSON.stringify(propArray), currTravelBox: JSON.stringify(travelBoxObj), accessToken: getAccessToken()}, function(data)
    {
        //DO STUFF
    });

$.ajax({
  url: "mydomain.com/url",
  type: "POST",
  dataType: "xml/html/script/json", // expected format for response
  contentType: "application/json", // send as JSON
  data: $.param( $("Element or Expression") ),

  complete: function() {
    //called when complete
  },

  success: function() {
    //called when successful
 },

  error: function() {
    //called when there is an error
  },
});

contentTypeString
Default: 'application/x-www-form-urlencoded; charset=UTF-8'

$.ajax({
  url: "mydomain.com/url",
  type: "POST",
  dataType: "xml/html/script/json", // expected format for response
  contentType: "application/json", // send as JSON
  data: JSON.stringify(data),

  complete: function() {
    //called when complete
  },

  success: function() {
    //called when successful
 },

  error: function() {
    //called when there is an error
  },
});