Checking in can be one of the worst experience while you're taking a flight
. Since it is so stressful and often mired with queues and angry passengers you should simply check in online in order to make the whole process simpler and quicker.
Checking in online means that you won't have to queue before you get to security. You simply go on to the website of your airline. Check to see if thet have the ability to check in online. If they do then you can fill in your flight details and any password. Then you'll be able to check-in. You will be asked a number of security questions similar to if you were to check in at the flight. Then you may be able to choose which seat you want on the plane. This is another advantage of checking in online. Flights from Atlanta to London are usually so busy that you'll not be able to get the seat that you want unless you check in online and choose a seat before you leave. Choose a seat that's on an emergency row if you want extra leg room, or choose one next to a window if you want to be able to sleep.
Then you'll need to print your boarding pass. This will be the receipt that you show when dropping off any bags and it'll be the thing you show security, passport control, and the cabin crew at your gate. It's also show your seat number. Checking online make flights from Dallas to Honolulu pass even quicker and not be such a stress.
So checking online is the best way to check in quickly. You can avoid the queues, and speed through the airport without any additional delay. So if flights from Portland to Rome allow you to check in online you always should.