The ordinary word for an airplane or aeroplane. It usually refers to a fixed-wing powered aircraft; 航空機 is broader and more technical.
Tomorrow morning, I’m going to Osaka by plane.
空港で飛行機を待っている。
I’m waiting for the plane at the airport.
I'm planning to go to Osaka by plane next month.
I was very nervous the first time I got on a plane.
I picked up my luggage right after getting off the plane.
The plane landed safely.
The plane couldn't take off due to bad weather.
flying wing
monoplane