I'll go on the record. DD_ has it for me. (note the underscore character ).
Brings back a child hood memory, my younger brother and I were loonies on bikes, the DDD's, 'Daring Dare Devils'. Not quite the same but I guess you get the gist.
If we (as a squad) meet up with another then flying as DD_ournick seems appropriate, and pretty much the way it is done elsewhere