Hi all,
We are flying Omaha-Chicago-London in December. We are not checking any bags and also plan to check in online the day before. Will we be able to go straight to security, or will we need to still go to the ticket counter in Omaha to have our passports checked? Or will we need to do something at O'Hare on our layover instead? I've never flown internationally before so all this is new to me!