CREATE TABLE table_name_93 (launch_date VARCHAR, deorbit_date VARCHAR)

When did the ATV that deorbited on 29 september 2008, launch?
SELECT launch_date FROM table_name_93 WHERE deorbit_date = "29 september 2008"
SELECT "launch_date" FROM "table_name_93" WHERE "29 september 2008" = "deorbit_date"