When we travel with (1) carryon only (2) during off-peak hours (3) checked in and with our (4) boarding passes in hand, we've been okay arriving at the airport no later than two hours before our flight leaves. For checked bag, we add an hour. For us taking a taxi from our marina, we call for a taxi 3 1/2 hours before our flight leaves. Perhaps an excess of caution, but Sweet Christine does not like to stress on a late arrival.
We've seen planes boarded 50 minutes before the flight is supposed to leave and doors closed early. Its worth considering your boarding time as a deadline for getting through security.
Our January trip there was snow hell on the east cost and it took us three tries to get home. We talked to more than one family who arrived late and missed a flight.
FYI, if you change your flight due to a connection cancellation after you're through security, they make you in security until your old departure lands and they deplane those passengers. Then they let you back out of the airport. It took us six days longer than planned to get back to DC after the big snow.
Cheers, RickG
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