Planning QR F BKK-DOH-FRA with 3 hours or so transit time. Have never been thru DOH and the aeroport website is confusing as to what is required of U.S. citizens simply making a darn connection QR to QR - QR's site is also unhelpful. They simply cannot say yes or no that you need to go through 1. security, 2. immigration and security, 3. immigration, customs, security. or 4. none of the above or another combination. And I thought Turkey's IST connection requirements listed under 12, twelve!, different scenarios was chaotic!! Any solid answers on the mysteries of DOH? Thanks.