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  var ajax_request = function(data){
    return $.ajax(url,{
      data: data,
      dataType: "json",
       method: "POST"
    });
  };
  
  var req1 = ajax_request({})
    .fail(function(jqXHR, textStatus, errorThrown){});
  var req2 = ajax_request({})
    .fail(function(jqXHR, textStatus, errorThrown){});
    
  $.when(req1,req2).done(function(datareq1,datareq2){
    //...
  });