I am going to travel on delta airlines in january, going out of dulles, connecting in ATL to DEN... i Have an electronic ticket. One of my options is curbside check in. my question is, what is the difference between curbside check in and Ticket-counter check in? is there a fee for using Curbside check in? i heard that you have to pay like $5 for it. can any one confirm or tell me that its wrong?