There are three international airports in the Moscow area: "Domodedovo" (serves more than 18 million passengers annually), "Sheremetyevo" (about 14 million passengers annually), "Vnukovo" (8 million passengers annually).
Don't forget your blanket. If you have a long journey ahead of you, you should have a small blanket to cover yourself with. It can be very cold on an airplane.
Always carry a scarf/sarong/pareo with you. They are lightweight and multi-functional. Sometimes you can lie on them and sometimes you can cover up. You can also dress in them and in extreme situations, you can make a headband out of them.
If you are traveling with kids, take devas. If you plan to travel by plane with small children - take a laptop, tablet or DVD player. Storytelling or playing games will allow you to kill a lot of time during which you can relax.
Flights to Moscow
List of popular destinations with flights arriving at Moscow airports