There were planefuls of tourists arriving at the airport.

The planeful of passengers arrived at the airport.

The planenesses of the surfaces were carefully measured.

The planeness of the surface is crucial for the accuracy of the measurements.

I saw three planes flying in the sky.

I saw a plane flying in the sky.

I am planing to go on a vacation next month.

I have a planing session tomorrow.

I have many planings for the weekend.

I folded a paper plane and flew it across the room.