tech stop

[diskoerekto]

I am a newbie and this is my first game. So forgive me if I am asking something stupid but in the new beginners world no matter what I do I cannot set a tech stop. It says me "Error: Refuel stop cannot be at the world's largest airports. Please choose a smaller airport for the technical stopover. Please try again." but I am trying to do them on backwater airports like Urumqi. Is there a problem with what I am trying to do or with the game?

[slither360]

You set the tech stop as your destination, then set the destination when it asks do you want a tech stop. The wording is slightly confusing.