Join Date: Feb 2006
Location: Cockeysville, MD
Programs: Marriott Rewards Lifetime Titanium, Amex Plat, Hertz Gold 5*, National Exec, AA Plat
Posts: 9,501
Southwest & Airtran
I have found that for these airlines (and probably others), you can simply checkin in online from your laptop (skip the printing) in your room and reprint your boarding pass at the airport.
For these specific airlines, it can allow you to get an A boarding pass or select your seat 24 hours in advance in the case of Airtan.