how many airlines have a hub at an airport run by ministry of land ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_operator dbr_Ministry_of_Land,_Infrastructure,_Transport_and_Tourism_ attr_open Japan attr_close sep_dot var_uri dbo_hubAirport var_x sep_dot var_uri a dbo_Airline brack_close