CREATE TABLE table_56457 ("Flight designation" TEXT, "Date" TEXT, "Duration" TEXT, "Pilot / co-pilot" TEXT, "Feathered  ( Fxx ) " TEXT)

When the duration was 11 min, 34 sec, what was the feathered (Fxx)?
SELECT "Feathered (Fxx)" FROM table_56457 WHERE "Duration" = '11 min, 34 sec'
SELECT "Feathered (Fxx)" FROM "table_56457" WHERE "Duration" = '11 min, 34 sec'