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Dark Fury Posted 10 years ago
Grammar

AWACS contact on four-hour intervals

Briefing before military operation:
Rendezvous points and radio freqs are indicated and fixed. AWACS contact on four-hour intervals.
Do "on four-hour intervals" and "at four-hour intervals" have the same meaning?
  

Top answer

Dark Fury Do "on four-hour intervals" and "at four-hour intervals" have the same meaning? Yes. )

— Mister Micawber

  • Dark Fury Do "on four-hour intervals" and "at four-hour intervals" have the same meaning?
  • Yes.
  • )
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3 Answers
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Dark FuryDo "on four-hour intervals" and "at four-hour intervals" have the same meaning?
Yes. (I have never seen 'on' before, however.)
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I see. Thank you.

PS: It's from Predator (1987).
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It meant that the team could expect to be in radio contact with a Boeing E-3 Sentry, commonly known as AWACS https://en.wikipedia.org/wiki/Boeing_E-3_Sentry every four hours.
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