I have had a little experience with Transit Visa's, best to ask but here is what I learned;
If you are NOT changing terminals and you will be in the airport less then 24hrs you do not need a Transit Visa. If you have to leave security you are entering the country. Also Transit Visa's can only be issued outside of the country you are in. Important Issue as the Russian Embassy in Ottawa said (in email) I could make a visa modification or get a transit visa at the SOV airport in Moscow, so based on that my wife and I planned a Honeymoon in Egypt. So to make a long story short we booked a resort in Egypt, I could not get a Transit Visa from within Russia (as I had to switch airports, even paying more the flight left from a different terminal) No one could help us the Canadian Embassy in Moscow did not understand why we were told we could as I even sent them the emails where I clearly stated what we were trying to do and included pictures of my passport and Russian visa. In the end we had to cancel our Egypt resort last minute and you can just guess how much we received in a refund lol.
Trust me I was not a happy camper and under the part of the IMM5490E Questionnaire #19 "Was There A Honeymoon" I explained we tried to and included all the mails and recpits lol