question: what's the airport with aircraft movements 2009 being smaller than 238223.1659471435 and change 2008/09 being 0.5%
answer: SELECT airport FROM table_13836704_4 WHERE aircraft_movements_2009 < 238223.1659471435 AND change_2008_09 = "0.5%"
context: CREATE TABLE table_13836704_4 (airport VARCHAR, aircraft_movements_2009 VARCHAR, change_2008_09 VARCHAR)