This app does not function correctly and offers incorrect info on tickets and on the price options ot offers. I picked an option that allowed me to pick seats, but after I paid it did not let me pick my seats. I picked the options to pick seats because I was booking for myself with physical limitations and for my 15 year old daughter who has not flown since she was 2 and doesnt remember ever flying. If my daughter gets upset She has abdominal pain and vomiting and neither Expedia or Delta cares.