In many modern airports, check-in desks and gates are no longer reserved for particular airlines. A gate screen might say “Delta” only because the next flight is a Delta flight. If the flight after the Delta flight will be Jet Blue, then the screen will change to Jet Blue when the Delta flight departs. Likewise, a check-in counter might have a screen showing that it’s a Croatian Air counter, but that screen might change to another airline later. You might pass this tip along to family or friends who don’t fly often. It might save some anxiety.