Ron Garret ) wrote:

It happens that there's another airplane at my airport with the exact
same identifier identifier except that it ends in "SP". In the air it
turns out that "zero poppa" and "sierra poppa" sound an awful lot alike
(try it), which has occasionally led to confusion when both planes are
in the pattern.

I trained in a C172 that ended in 0LP (Zero Lima Poppa). Most times
when I used the abbreviated callsign, the controller would almost always
hear "Zero Juliet Poppa" and call back to ask which call sign it was.

Those two also sound similar over the radio when 0LP is spoken a bit too
fast.

--
Peter