I have a "short" tail number on my Lancair ES----N98AF.  I have never had a
controller ask for my "full call sign".  I believe that is the case because I
always check in with new controllers, whether ground, tower, departure,
center or anyone else the way my flight instructor taught me.  Simply, I was
taught to always identify myself to new controllers with my aircraft name and
full tail number.  When I was flying Cessna 172's the initial contact was
always "Cessna 737GC" or "Cessna 4752N" or if flying a Piper Archer it was
"Archer 3646F".  Subsequent contacts required only the last three digits
(7GC, 52N or 46F).

I was occasionally asked what model of Cessna or Piper it was but there never
seemed to be any question about my tail number.

When flying my Lancair I always check on with "Lancair 98AF".   For the rest
of the contacts with that controller  I use "8AF" and so does the controller.
 When I get handed off I start over with full identification.  Simple and
works for me.

I like the short tail number that I have.  I believe it identifies the plane
as being a little different and possibly special.  I think that is nice and
good thing for homebuilders.

I would agree with the person who posted that there are certain letters to
avoid.  I tried several combinations in practice and tried to picture myself
saying those words thousands of times.  I definitely passed on several
attractive sets that were just too hard to say.  But that is just me.

Thought I would add my viewpoint.  I believe the circle is now complete.

 Jim Scales
 98AF Lancair Super ES
"Angel's Playmate"