Having flown through Dulles for the first time, I have one observation: the security lines are nothing to joke about. We waited about an hour in three different lines in order to clear the TSA security check.
Having flown KLM for the first time, I have one observation: they are serious about carry-on weight restrictions - the first airline that I've actually had check this that I can remember - causing an inconvenient repack at the check-in counter.
Having flown without children for the first time in a while, I have two observations - I think this is the longest that I've had to dedicate to doing whatever I want without interruption in months/years? And, I miss the girls!