different between airted vs airtel

English

airted

airtel (plural airtels)

A form of communication formerly used within the FBI, indicating a letter that had to be typed and mailed on the same day.
- 1976, United States Congress, FBI Oversight: Hearings Before the Subcommittee on Civil and Constitutional Rights of the Committee on the Judiciary
  An airtel from the Dallas office to this Bureau dated October 30, 1963, wherein SA James P. Mosty, Jr., reported a pretext interview in the vicinity of 2515 West Fifth Street, Irving, Texas.

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