vanish into thin air
dissolve into thin air
disappear into thin air

But for the moment they seemed to have vanished into thin air.

It was almost as if he'd vanished into thin air.

In less than a minute, she had vanished into thin air.

But not so easy to make a body vanish into thin air.

It was also said that he then vanished into thin air.

For, at my touch, she would only have vanished into thin air.

And how do they vanish into thin air like that?

But how could they have vanished into thin air without me seeing them?

But seeing a human boy vanish into thin air right in front of them might have.

How was it possible for any child to vanish into thin air, the way he had done?

I gave up my drunk act and vanished into thin air.

Each time a child had virtually vanished into thin air.

"Are you saying the captain simply vanished into thin air?"

When faced he is said to vanish into thin air.

A woman friend saw her driving out of town a few minutes later; after that she just vanished into thin air.

The hours left seemed at once to crawl by, and vanish into thin air.

"I tried to get in touch with him, but he's vanished into thin air."

Vanished into thin air, gone in the blink of an eye.

He got lost in the forest while looking for something and apparently vanished into thin air.

It must be as though the whole lot has vanished into thin air."

How many more of his friends would simply vanish into thin air before this ugly business was done?

To all appearances, Flight 412 has simply vanished into thin air.

Seemed that several top scientists they were investigating vanished into thin air.

Each one simply upped and left, vanished into thin air.

Wonder if my reply to you showed up at all or just vanished into thin air!