But what if I am checking luggage, you ask? When time is critical, checking in online still holds an advantage. Most carriers have separate lines at ticketing for “full” versus “luggage only” check-in. The “luggage only” line always moves faster because all you have to do is scan your boarding pass, drop off your bags and head through security. And when you’re close to that forty five minute cutoff (it applies for luggage as well), a fast moving line is critical.