Which countries has the most number of airlines whose active status is 'Y'?
return countries ;return airlines of  #1 ;return active statuses of  #2 ;return #2 where #3 is  'Y ;return number of  #4 for each  #1 ;return #1 where #5 is  highest
['select', 'project', 'project', 'comparative', 'group', 'superlative']