R, for “received.”

[keannu]

https://www.idiomsandslang.com/roger-roger-that/

Roger; Roger That
Definition: your message has been received and understood
Example: “Once you see a CVS drugstore on the right, take the next left.” —”Roger that.”
Note: From British military abbreviation R, for “received.”

I can't understand how "R" changed into "Roger", could you explain it to me?

[GoesStation]

In the phonetic alphabet currently used in American aviation, R is romeo. Apparently at one time the British military used roger.

[probus]

It is jargon specific to radio communications. As a pilot I can tell you that "roger" is sill used daily in aviation around the world. It is just an acknowledgement that one has received and understood a transmission. Here is a real life example.

We had taken off from Buffalo, New York and landed at a small airport in Canada. We were sitting on the ground with our engine running waiting to see if a customs agent was going to show up to inspect us.

Air Traffic Control: Niner Niner Echo, are you just here to clear customs?

Me: Affirmative, clear customs.

ATC: Where are you going from here?

Me: We're still working on that.

ATC: Okay I'm just going to close your flight plan.

Me: Roger, thank you.

"Wilco" on the other hand is an abbreviation for "will comply". It is no longer used, except perhaps in the military.

[Tarheel]

Niner Niner Echo = 990?

[GoesStation]

Niner Niner Echo = 990?

99E. This would be the last three characters of the airplane's tail number (its unique identifier).

[michaelhang]

https://www.idiomsandslang.com/roger-roger-that/

Roger; Roger That
Definition: your message has been received and understood
Example: “Once you see a CVS drugstore on the right, take the next left.” —”Roger that.”
Note: From British military abbreviation R, for “received.”

I can't understand how "R" changed into "Roger", could you explain it to me?

“Roger” is a U.S. phonetic alphabet. In 1957, the English phonetic alphabet changed the R to “Romeo,”.Roger” means “r,” which stands for “received.” and the word “Roger” means nothing more.

[probus]

“Roger” is a U.S. phonetic alphabet. In 1957, the English phonetic alphabet changed the R to “Romeo,”.Roger” means “r,” which stands for “received.” and the word “Roger” means nothing more.

No. As you say, and as I said before, roger is used in radio communications to acknowledge receipt of a transmission. It is not a "U. S. phonetic alphabet."