CREATE TABLE table_204_514 (id DECIMAL, "date" TEXT, "sub" DECIMAL, "flight" TEXT, "dead" DECIMAL, "hurt" DECIMAL, "pax." DECIMAL, "type" TEXT, "perpetrator" TEXT, "description" TEXT)

which airliner attack on the list had the most dead ?
SELECT "flight" FROM table_204_514 ORDER BY "dead" DESC LIMIT 1
SELECT "flight" FROM "table_204_514" ORDER BY "dead" DESC NULLS LAST LIMIT 1