This is the 15159th most frequent Polish word.
samolotach
"Samolotach" means "airplanes" in the locative plural form in English.
The word "samolotach" is used in its locative plural form to indicate traveling 'in' the airplanes.
Podróżowaliśmy dawniej samolotach wojskowych.
We used to travel in military airplanes.
Here, "samolotach" is in the locative plural form to describe the subject of actions 'about' the airplanes.
Widziałem filmy o pięknych samolotach.
I saw movies about beautiful airplanes.
"Samolotach" is used in the locative plural form to specify the stories being 'about' the airplanes.