Why was the "Airport" icon chosen to mean: "radio emissions on your device are disabled"?

I am amused as I drive around nowadays and see "Airport" icons on blue informational signs and I have cause to think: "Well, no WiFi or Bluetooth there!" That is probably what children are thinking. They probably wonder why an airport cannot afford WiFi.

Is this good UX, to re-use an already well-established informational sign icon for something with an entirely different meaning?

Update: It was pointed out that there are many radio-emitting aspects of a phone beyond Wifi and Bluetooth and so I suggest that there be a single icon that covers all of the radio emitting aspects, like a little antenna with lightning bolts coming out of it. (I think this already exists...) Could they simply draw the red-circle-with-slash icon over such a Radio Emissions icon? Would that be obvious to everyone?

Further update: Apparently WiFi is allowed on some flights now, so that raises the question of why I see an airplane when I turn off WiFi on my laptop. But... the original question - why was the existing sign icon commandeered for something unrelated (airport nearby vs don't interfere with the plane) - is still very much on the table. I wish people would actually address that question, not the history of "why / how it came to be thus, mumble mumble." Please.

This Is Your Airport Sign (two lanes don't have Wifi? What?)

... And This Is Your Airport Sign On Windows 10 (note that I have network access):

Any Questions?

It looks like this is the only wireless setting on my laptop:

They think that a Wired Connection is No Connection At All:

"Your part will be to remain calm."