CREATE TABLE table_27282 ("Episode #" FLOAT, "Production Count" FLOAT, "Original Airdate" TEXT, "Prod. Code" TEXT, "Title" TEXT, "Viewing Figures Millions" TEXT)

What are the original air date(s) for episodes with 8.63 million viewers?
SELECT "Original Airdate" FROM table_27282 WHERE "Viewing Figures Millions" = '8.63'
SELECT "Original Airdate" FROM "table_27282" WHERE "Viewing Figures Millions" = '8.63'