CREATE TABLE table_13975 ("Country" TEXT, "Airport" TEXT, "City" TEXT, "2008" FLOAT, "Change  ( 08/07 ) " TEXT)

Which Country has a Change (08/07) of unknown, and a 2008 larger than 1,102,497, and a City of luanda?
SELECT "Country" FROM table_13975 WHERE "Change (08/07)" = 'unknown' AND "2008" > '1,102,497' AND "City" = 'luanda'
SELECT "Country" FROM "table_13975" WHERE "2008" > '1,102,497' AND "Change (08/07)" = 'unknown' AND "City" = 'luanda'