Sorry to hear your experience. I used the stamped visa , without any problem, once when departing Melbourne but that was with Qantas. With Jetstar having a much lower profile flying into the US, they would see very few of these. No excuse for poor service but understandable. And yes , the airline gets a very hefty fine .. and the employee would be “
written up” if they boarded someone who was found ineligible to enter the US Again no excuse but certainly explains the extreme caution. Thankfully someone finally
had the idea of actually calling CBP using the number in their handbook
!!