Statek powietrzny in English:

Two aircraft of unknown origin flew over the Polish territory.

Please remain seated until the aircraft arrives at the gate.

Aircraft is both singular and plural - one aircraft, two aircraft.

The fuselage is hollow to reduce weight. As with most other parts of the airplane, the shape of the fuselage is normally determined by the mission of the aircraft.

Tatsuo likes looking at aircraft landing gears.

The newspaper company has ten aircraft.

When the flight crew has their aircraft under control, everything is working normally and yet it still crashes into the ground, that's CFIT.

Thanks to the development of aircraft, the world has become much smaller.

Ships can't rival aircraft for speed.