I lived in Annandale first then Chantilly which is close to Dulles. Annandale is great a bit old fashioned slightly 70's styles houses but a good neighbourhood. Lots of government and forces people live there.
Chantilly is much more modern probably more young families.
If you have v successful husbands then head to McLean which is a very nice area and close to the most amazing shopping mall called Tysons Corner.
Schools are differently but good, generally good enthusiastic helpful teachers who actually enjoy their job and like kids, very good provision for gifted and talented kids and they do lots of sport.
If you do sport outside of school you will be expected to get involved and help organise things, attend events etc just dropping off and picking up is not te done thing.
Most neighbourhoods have a community pool, tennis courts and playgrounds with a clubhouse. The pool is te best place to meet people but if you arrive in the fall and pool is clsed don't worry you will probably find half the neighbourhood dropping by to welcome you to the area, that all love Brits!
Best of all no more school run, they will get picked up at te end of the road by the big yellow bus.
Don't worry too much about the flight, we used to travel back a couple of times a year well before the advent if DVD 's and ds's. The lights are usually good times you will all be fine.
Hope this helps x