CREATE TABLE table_20079 ("No. in season" FLOAT, "No. disc" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT)

What was the original air date of Stargate SG-1 written by Peter Deluise?
SELECT "Original air date" FROM table_20079 WHERE "Written by" = 'Peter DeLuise'
SELECT "Original air date" FROM "table_20079" WHERE "Written by" = 'Peter DeLuise'