On Jan 5th I went AGP-FRA-IAH with a overnight at the Hilton at the Squire. No testing needed, no one asked. I did get a PCR done for personal reasons at the testing site on the walkway between the Squire and terminal the next morning on my way to catch my flight to IAH. Had results before I landed in IAH. Also on return, a 3 hour transit in FRA and I did have a neg PCR for Spain entry but no one in FRA asked, this was Jan 11th.