I can say if you are based in moscow better use aeroflot make sure about the booking classes and miles accumulation though. if you want to earn extra miles get the aeroflot credit card. Aeroflot has offices on arbat street and just go in and take a number usually go early or it gets busy. Also economy comfort plus seats for free but again book early they go fast but is free for gold members they also have a great website in english as well waiting for the SU app for my phone. One more thing you can go to old SVO 2 they have 24 hour ticketing office its only 30 minutes drive at midnight from tverskaya change tickets face to face no traffic!