lotniskiem

In a sentence

• Spotkaliśmy się na lotnisku, aby pożegnać podróżnych.

  We met at the airport to bid farewell to the travelers.

  The word 'lotnisku' is the instrumental case of 'lotnisko', used here to indicate the location of the meeting.

• Podróżni byli zadowoleni z usług oferowanych na lotnisku.

  The travelers were satisfied with the services offered at the airport.

  'Lotnisku' in this sentence is also in the instrumental case, describing where the services were provided.

• Przeszliśmy przez lotnisko w drodze do hotelu.

  We passed through the airport on our way to the hotel.

  Here, 'lotnisko' is used in the accusative case, as it indicates the direct object of the verb 'poprzez' (passed through).