Difference

var guests = 1;
var startingDate = '2015-2-22';
var endingDate = '2015-2-27';

var a,b,c,d;

$.get('/api/v1/apartment-mixed-availabilities?' +
      'guests=' + guests + '&startingDate=' + startingDate + '&endingDate=' + endingDate,
function(data){
  a = JSON.stringify(data.availabilityIndex);
  b = JSON.stringify(data.availabilityClusterIndex);
  $.get('/api/v1/apartment-availabilities?' +
      'guests=' + guests + '&startingDate=' + startingDate + '&endingDate=' + endingDate,
  function(data){
    c = JSON.stringify(data.availabilityIndex);
    $.get('/api/v1/apartment-cluster-availabilities?' +
      'guests=' + guests + '&startingDate=' + startingDate + '&endingDate=' + endingDate,
    function(data){
      d = JSON.stringify(data.availabilityClusterIndex);
      console.log(a===c, b===d);
    });
  });
});