CREATE TABLE table_73007 ("No. overall" FLOAT, "Title" TEXT, "Director" TEXT, "Writer" TEXT, "Original air date" TEXT, "Production code" FLOAT)

When did the episodes first air that had a production code of 107?
SELECT "Original air date" FROM table_73007 WHERE "Production code" = '107'
SELECT "Original air date" FROM "table_73007" WHERE "Production code" = '107'