Converse of object

• leave: He looked out the window momentarily and saw a 737 leaving a contrail at 33,000 feet in the serene blue sky.

• spot: Along the way, Claiborne said, he spotted the contrails of a jet streaking toward the car.

• see: It is now almost impossible to look up and not see the contrail of one, or three.

Preposition: in

• sky: Visibility was very good with some cirrus and contrails in the sky.

Adjective modifier

• normal: Unlike normal contrails behind commercial jets which dissipate quickly, these lingered for hours, came together and obscured the sky.

• several: Several contrails had drifted across the sky, unusual for here, more like the vicinity of Manchester Airport.

Modifies a noun

• formation: Several possible aviation demand growth scenarios as well as various policy options to minimize contrail formation will be examined.

• stock: Then when these had been held down with small pieces of masking tape, I cut the struts from Contrail stock.

• rod: A short length of Contrail rod was used to attach them to the fuselage.

Noun used with modifier

• aircraft: Note the aircraft contrail at the top of the picture which has also taken on the color of the sunrise.

• jet: For example, features such as clouds and jet contrails may appear on one image and not on the other.