Upvote:1
At the airport I use the queue is divided into 'Selected passports' and 'All passports'. And as far as I remember the 'selected passports' used to be Schengen countries only but is now wider and uses mostly automated passport gates.
But that leaves everybody to use the 'all passports' as not everybody can use the automated gates and some people chose to stay with a travel companion who can not use the gates even when they themselves can.
Everybody is processed as soon as they arrive in the secure area of the airport, so all people are mixed.
I have not used the exit immigration in other countries in a long while but as far as I understand they all allow everybody to use the 'all passports' but some may process the passengers per flight, especially if the airport does not have many flights out of the country or area.
Mostly information regarding the country you go to is collected and checked by the airline, not by exit immigration, those mostly check you were within the limits of your visa and whether there is a 'do not let this person leave the country' order.
So the country you leave is not interested in where you are going.
The airlines may share the information also with the departure country, which is much more common than getting the information from departing passengers at a passport check. But the officer will usually ask or read it on your boarding pass.