apocryphal story from the 60's
Aeroflot routeing to EINN and then to Cuba at time of tension...
"Aeroflot 123 do you carry transponder?"
"Negative sir, ve only carry agricultural equipment"
and
on Red 3 EGAA to EGGP!!
"Preston this is Cambrian 123 is FL80 available?"
"Cambrian 123, Preston, Affirmative climb to FL80"
"Negative Preston, we don't want FL80, just wanted to know if it was available!"