This is my first time going to US. I going to book a ticket in Etihad airlines traveling from Chennai to Chicago with layovers at Abu Dhabi (2 hours 20 minutes transit time) and Manchester. My question is,
1) Will I be allowed to enter US preclearance at Abu Dhabi since I must change flight at Manchester? If so, is 2 hours enough to clear the preclearance and board the flight?
2) If I make it to Manchester after US preclearance, should I check-in my luggage there, or the airline would take care of it?