Hi, I have read conflicting information on the necessity of a middle name on an airline ticket when the passport has the middle name. My passport has my middle name and I have never booked a ticket anywhere with the middle name on it. Now I have a variety of trips booked for my family and I still don't have the middle name on the tickets. The first trip I am concerned about(and my biggest concern) is my daughter's with her boyfriend to Europe. I just found out his middle name is on his passport. They are flying AA, BA and IB in a week. Next, my husband and I are flying LAN to SCL and IPC in April, then in September, we are flying CX to Hong Kong and Bali. No middle name on any of those tickets, yet it does appear on our passports. What is the worst case scenario that we might encounter? Thank you!