I searched flights, but the transfer times seem pretty short. I want to go from Hamburg, Germany, to St. Louis, MO. The itinerary for the flight I want to take is:
Hamburg -> London
1h 5m transfer time
London -> Chicago
1h 50m transfer time
Chicago -> St. Louis
I've never been to the USA before but have got an approved ESTA application. Another point worth considering is that I'm 16 (I don't know if this affects anything). 1h in London should be enough, but I think 1h50m could be too short for entering the USA.
How much time do I need to enter the USA at Chicago O'Hare?
If I miss my flight because I had to wait at CBP, will I get booked to another flight at no cost?
The flight is operated by British Airways in cooperation with American Airlines.