I know that the question of how early to arrive at the airport depends on the airport and how busy it is at particular times. For a domestic flight leaving Logan (Boston) on a Tuesday at 6:30PM, with no checked baggage, how much time should I allow to get through security and to the correct terminal/gate? I do not have any privileged status (airline clubs, expedited security, etc).
Boston Logan is one of the most efficient airports I have flown in and out of. It is also a huge airport. From my experience, if you don't require assistance, I reckon you be at the airport at least an hour before your flight departs.