Thanks for your reply.

They would be checked in online - probably the day before. I will also be checked in online.

Their mother would only let them chekc in their case once she knows I am on the ay (she can check the flight status) . She will only let them go to the boarding pass check, security and passport control if she was 100% sure I would be waitign airside and, if necessary, we will arrange a chapperone with the airport to wait with them until I get to them.

So I would call their mother as soon as I land, they can then go through boarding pass check, security and passport control

We would all be together when we go to the actual boarding gate when called

Wouldn't this work ?

Im trying to find out if I can use a transit route to get from the arrivals hall to the departure hall without having to go out through passport control. Sofia Airport (Terminal 1) are telling me that the arrival hall and departure hall are in different buildings but I am sure I have seen a transit sign just before the arrivals passport control and surely they must provide this for people whco do not have visas to enter Bulgaria and are pssing through ?