We usually fly BA but DD is seeing friends in the USA, so we booked her onto a Delta flight because it was cheaper and she was happy with this. All her pre flight information had been completed and the ESTA updated. Her seat was chosen and the boarding pass printed at home.
At the bag drop, at T3 Heathrow, after presenting her passport, she was referred to a "security" officer who asked her all the questions that were already entered on the pre flight data. Is this normal with Delta? We have never had this with BA and have never even seen any security people at bag drop in T5. Why would she have been referred to them? Is it random, or are there reasons why some people have to go over all the information again? Any views would be appreciated.