Classic Analytics ( ga.js ) now deprecated
100% of Google Analytics properties have been transferred to Universal Analytics, and all new properties will be Universal Analytics properties. If you are still using a legacy tracking library on your website (such as ga.js), you should strongly consider upgrading your tracking code to get all the benefits of Universal Analytics.
This only affects properties that have been using cross-domain tracking with their booking engine via the legacy ga.js tracking library. However, all properties should migrate since Google is deprecating non-Universal libraries in the near future.
How to upgrade
The following guide will walk you through upgrading your tracking implementation to use Universal Analytics: