"My first thought was they looked like contrails from aircraft."

So it's just a contrail playing tricks with my eyes.

The contrails to the west were becoming too bright to look at.

He could see the contrails below him, like white threads against the dark water.

A second contrail, miles high, made another white streak across the sky.

But atmospheric conditions today were such that contrails did not form.

There were no contrails in the milky sky above the house.

It left a contrail that lingered for about half an hour.

He saw the contrails, two of them, racing across the terrain.

Twin contrails appeared in the sky, coming at a dead run from the south.

He saw the contrail, thin as a thread, off to the west.

What is a contrail and how does it form?

They left contrails like toothpaste in the clear blue sky over the sound.

Gradually, off in the distance, the distinctive contrails once again came into view.

He could make out a shape above, a dark dart with a thin white contrail.

The red, white and blue contrails represents the colors of the American flag.

They could see the white contrail heading straight for :hem.

Because of that, hardly any contrails were over the United States.

Too high to do me any good; all I could see was the contrail etching itself across the sky.

A second later, he saw three contrails snaking toward Lancaster.

I wanted something that showed enemy action, antiaircraft fire and contrails.

Winters took a look around to make sure he wasn't leaving any contrails to give away his position.

Contrails: four, five, six of them, streaking from the east.

If the atmosphere is near saturation, the contrail may exist for some time.

Persistent spreading contrails are thought to have a significant effect on global climate.

The actual question is sometimes lost in the vapour trail.

This time of day, it's not too hard to see a missile's vapour trail.

The vapour trail, at that hour of the morning in those air conditions, had become visible very late.

There's a good chance they won't spot the vapour trail if they're not looking for it.

Brooks knew that by dumping fuel they could produce a vapour trail.

A highly radioactive vapour trail is seen coming from the heart of the destroyed reactor.

The flame will jump up to a centimeter down the vapour trail.

They may notice a distinctive noise from its engine or the number of vapour trails it is leaving.

The sky was very big and very blue, with seven planes visible but no vapour trails.

A jumbo jet, passing very high (obviously), left no vapour trail.

They have remained together since, releasing their latest album, Vapour Trails, in 2007.

'But it's become the best economic indicator there is - like vapour trails above a city in the old days.

Walker was all vim, vigour and vapour trails down the flank.

A vapour trail rose from his mouth.

It was leaving an impressive vapour trail.

Criss-crossing vapour trails sprang into being against the washed blue which was visible between the clouds.

Subconsciously, he was looking for the vapour trail of Laskov's missile.

The sky was a searing-blue dome, marked only by a high vapour trail and the lights of habitats.

It was hoped the DC-10 would be making a vapour trail to make it more visible.

Linear cloud disappeared into the blue distance above the turnpike's route, like sections of vapour trail.

But there was never any sign of their presence, save an occasional vapour trail high against the blue of the stratosphere.

His hands left vapour trails when he moved them, and his eyes made whooooshing sounds.

Ruth flopped back in the lounger and studied the vapour trail through half-closed eyes.

The white pulse of his breath was as crisp as a vapour trail against the ruined armour.

Vapour trails wove a net through the clear blue sky, and twice again they heard low-flying jets.

A high plane left a figure eight of white vapor trail across the sky.

The actual question is sometimes lost in the vapour trail.

He could see the vapor trails of the war rockets on the way out from Earth.

It seemed to hang like a vapor trail long after its source was gone.

He glanced up and saw the vapor trails in the sky.

His voice was like a vapor trail in the night sky; her hands opened, trying to catch it.

He could see vapor trails on both sides, but those were almost certainly other aircraft of the attack group.

This time of day, it's not too hard to see a missile's vapour trail.

The vapor trails in the sky left us feeling sick and fearful.

The vapour trail, at that hour of the morning in those air conditions, had become visible very late.

Its vapor trail spread, cold silver on a sky of slate.

The spotter can track the shot by watching for that vapor trail.

A fist flashed into his palm so quickly I only saw the vapor trail.

The moist air condensed behind them and left a vapor trail in front of their sound.

Above, through much of the day, were the vapor trails of American bombers.

There was an enormous cloud behind us that created a massive vapor trail.

They must have felt as though their guts were being dragged up to orbit on me same vapor trail.

In silence the vapor trail expanded and begin to disperse.

It sidesteps me, leaving a vapor trail in its wake.

The green puffball was closer yet, and a line of vapor trailed behind it.

He pointed to the vapor trail of a vessel entering atmosphere.

It left a long, dark vapor trail behind it, stretching out of view.

The object changed course slightly, and the vapor trail twisted around like some sort of cable.

It was a ruined street hanging in the sky, faint as a vapor trail.

The fire ignited the vapor trail, which became a flame a hundred yards long.