This is the 4574th most frequent Polish word.
lotnicze
"Aviation" or "aerial" (adjective, related to aircraft or flying).
Here, 'lotnicza' is an adjective describing 'maszyna' (machine), translating to 'air' or 'flying' in relation to aviation.
Maszyna lotnicza wylądowała na polu.
The flying machine landed in the field.
In this case, 'lotnicze' functions as an adjective describing 'części' (parts), indicating that these parts pertain to aviation.
Firma produkuje części lotnicze.
The company produces aviation parts.
Here, 'lotnicze' is an adjective modifying 'manewry' (maneuvers), referring to maneuvers performed during flight.