Originally Posted by
WineCountryUA
Your first concern should be if UA will even allow you to check-thru as you exceed the max 12 hour policy.
If you does allow check-thru, believe this will be transferred to ET on arrival and not sitting in UA's area.
Agree on both counts. However, if UA does allow them to be checked through, when you arrive at the ET counter and/or gate in T5 to continue your journey, you should show them your UA bag tags and ask them to confirm that they see those tags in their system.