* Show the number of aircraft in your data set

USE ALL.
COMPUTE filter_$=(p_desc = '01').
VARIABLE LABEL filter_$ "p_desc = '01' (FILTER)".
VALUE LABELS filter_$  0 'Not Selected' 1 'Selected'.
FORMAT filter_$ (f1.0).
FILTER BY filter_$.
EXECUTE .
FREQUENCIES
  VARIABLES=p_desc
  /ORDER=  ANALYSIS .

*You can use the total number of lines in your file to determine the percentage of aircraft in your data