I will be flying into Montreal from ATL and this is my first international flight. I have only ever drove across the border before.

I am not sure what to expect with customs and have heard it is a long process. How long does it generally take and what exactly is the process- do I get my luggage and bring it with me to go thru or get it afterwards?

I also wonder what it is like upon return to ATL and do I need to arrive earlier than usual for this international flight?

I am looking forward to this being the first of many international flights.

Many thanks!