The phrase "air onslaught" is correct and usable in written English.
It can be used to describe a sudden and intense attack or assault from the air, often in a military or metaphorical context.
Example: "The air onslaught from the enemy forces caught us off guard, leaving little time to prepare for the attack."
Alternatives: "aerial assault" or "air attack".
We have taken all measures to avoid the air onslaught and all our rockets are ready now to be launched.
But this is less to do with Isis and much more with the fact that Sunni rebels, backed by Saudis and the Turks, are rapidly losing ground to the forces of Bashar al-Assad, supported by a ferocious Russian air onslaught, Iranian 'volunteers' and fighters from the Lebanese Hezbollah.
Moscow's air onslaught appears to be gaining effectiveness as Russian commanders grow more familiar with the conflict and with the capabilities of allied Syrian ground forces, observers say.
This on-air onslaught offers the rest of us a preview of what television viewing will be like as Election Day 2012 draws closer.
If its jolting production didn't keep it off the air, its onslaught of four-letter words might.
News that the Tamil Tigers had retained the ability to strike Colombo by air despite the government onslaught was surprising, said Daniel Markey, senior fellow for India, Pakistan and South Asia at the Council on Foreign Relations.
Maue said the storm is teaming with a strong area of high pressure over northern Europe in forcing an onslaught of mild air toward the North Pole through the Barents and Kara Seas.
Sunni Muslim rebels in the city 90 miles (140 km) north of Damascus have been suffering an onslaught of ground and air attacks.
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With its tragic right-left onslaught, smoke hanging in the air as one of the soldiers recharges his fatal rifle, just to be sure, this was the National Gallery's first foray into modern art.
It was one of the biggest series of air strikes since the coalition's initial onslaught, our correspondent says.
