You can view your flight itinerary and confirmation number in the "Flights and Hotels" section of your online account; this information becomes available at 30 days prior to the scheduled departure date for your trip.
To check in for your flight: Visit your airline's website as soon as 24-hours prior to the departure of your first flight. Use the confirmation number in your online account to check in. You will also be able to view your seats and, if permitted by the airlines, confirm your seating preferences.
Boarding pass options: You can print out your boarding pass via the airline's website when you check in, or at the airport when you arrive. Pro tip: See if your airline offers mobile boarding passes; it's one less thing to carry, and one more tree saved.
Arriving at the airport: Give yourself plenty of time. Even if you've already checked in online, we strongly recommend you get to the airport at least 2.5 hours before your flight is scheduled to depart.