CREATE TABLE table_55123 ("Episode #" FLOAT, "# in Season" FLOAT, "Episode Name" TEXT, "Airdate" TEXT, "Location" TEXT)

Which air date has 5 for # in season?
SELECT "Airdate" FROM table_55123 WHERE "# in Season" = '5'
SELECT "Airdate" FROM "table_55123" WHERE "# in Season" = '5'